<?php
/**
 * Misc WordPress Administration API.
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * Returns whether the server is running Apache with the mod_rewrite module loaded.
 *
 * @since 2.0.0
 *
 * @return bool Whether the server is running Apache with the mod_rewrite module loaded.
 */
function got_mod_rewrite() {
	$got_rewrite = apache_mod_loaded( 'mod_rewrite', true );

	/**
	 * Filters whether Apache and mod_rewrite are present.
	 *
	 * This filter was previously used to force URL rewriting for other servers,
	 * like nginx. Use the {@see 'got_url_rewrite'} filter in got_url_rewrite() instead.
	 *
	 * @since 2.5.0
	 *
	 * @see got_url_rewrite()
	 *
	 * @param bool $got_rewrite Whether Apache and mod_rewrite are present.
	 */
	return apply_filters( 'got_rewrite', $got_rewrite );
}

/**
 * Returns whether the server supports URL rewriting.
 *
 * Detects Apache's mod_rewrite, IIS 7.0+ permalink support, and nginx.
 *
 * @since 3.7.0
 *
 * @global bool $is_nginx
 *
 * @return bool Whether the server supports URL rewriting.
 */
function got_url_rewrite() {
	$got_url_rewrite = ( got_mod_rewrite() || $GLOBALS['is_nginx'] || iis7_supports_permalinks() );

	/**
	 * Filters whether URL rewriting is available.
	 *
	 * @since 3.7.0
	 *
	 * @param bool $got_url_rewrite Whether URL rewriting is available.
	 */
	return apply_filters( 'got_url_rewrite', $got_url_rewrite );
}

/**
 * Extracts strings from between the BEGIN and END markers in the .htaccess file.
 *
 * @since 1.5.0
 *
 * @param string $filename Filename to extract the strings from.
 * @param string $marker   The marker to extract the strings from.
 * @return string[] An array of strings from a file (.htaccess) from between BEGIN and END markers.
 */
function extract_from_markers( $filename, $marker ) {
	$result = array();

	if ( ! file_exists( $filename ) ) {
		return $result;
	}

	$markerdata = explode( "\n", implode( '', file( $filename ) ) );

	$state = false;
	foreach ( $markerdata as $markerline ) {
		if ( false !== strpos( $markerline, '# END ' . $marker ) ) {
			$state = false;
		}
		if ( $state ) {
			if ( '#' === substr( $markerline, 0, 1 ) ) {
				continue;
			}
			$result[] = $markerline;
		}
		if ( false !== strpos( $markerline, '# BEGIN ' . $marker ) ) {
			$state = true;
		}
	}

	return $result;
}

/**
 * Inserts an array of strings into a file (.htaccess), placing it between
 * BEGIN and END markers.
 *
 * Replaces existing marked info. Retains surrounding
 * data. Creates file if none exists.
 *
 * @since 1.5.0
 *
 * @param string       $filename  Filename to alter.
 * @param string       $marker    The marker to alter.
 * @param array|string $insertion The new content to insert.
 * @return bool True on write success, false on failure.
 */
function insert_with_markers( $filename, $marker, $insertion ) {
	if ( ! file_exists( $filename ) ) {
		if ( ! is_writable( dirname( $filename ) ) ) {
			return false;
		}

		if ( ! touch( $filename ) ) {
			return false;
		}

		// Make sure the file is created with a minimum set of permissions.
		$perms = fileperms( $filename );
		if ( $perms ) {
			chmod( $filename, $perms | 0644 );
		}
	} elseif ( ! is_writeable( $filename ) ) {
		return false;
	}

	if ( ! is_array( $insertion ) ) {
		$insertion = explode( "\n", $insertion );
	}

	$switched_locale = switch_to_locale( get_locale() );

	$instructions = sprintf(
		/* translators: 1: Marker. */
		__(
			'The directives (lines) between "BEGIN %1$s" and "END %1$s" are
dynamically generated, and should only be modified via WordPress filters.
Any changes to the directives between these markers will be overwritten.'
		),
		$marker
	);

	$instructions = explode( "\n", $instructions );
	foreach ( $instructions as $line => $text ) {
		$instructions[ $line ] = '# ' . $text;
	}

	/**
	 * Filters the inline instructions inserted before the dynamically generated content.
	 *
	 * @since 5.3.0
	 *
	 * @param string[] $instructions Array of lines with inline instructions.
	 * @param string   $marker       The marker being inserted.
	 */
	$instructions = apply_filters( 'insert_with_markers_inline_instructions', $instructions, $marker );

	if ( $switched_locale ) {
		restore_previous_locale();
	}

	$insertion = array_merge( $instructions, $insertion );

	$start_marker = "# BEGIN {$marker}";
	$end_marker   = "# END {$marker}";

	$fp = fopen( $filename, 'r+' );
	if ( ! $fp ) {
		return false;
	}

	// Attempt to get a lock. If the filesystem supports locking, this will block until the lock is acquired.
	flock( $fp, LOCK_EX );

	$lines = array();
	while ( ! feof( $fp ) ) {
		$lines[] = rtrim( fgets( $fp ), "\r\n" );
	}

	// Split out the existing file into the preceding lines, and those that appear after the marker.
	$pre_lines        = array();
	$post_lines       = array();
	$existing_lines   = array();
	$found_marker     = false;
	$found_end_marker = false;
	foreach ( $lines as $line ) {
		if ( ! $found_marker && false !== strpos( $line, $start_marker ) ) {
			$found_marker = true;
			continue;
		} elseif ( ! $found_end_marker && false !== strpos( $line, $end_marker ) ) {
			$found_end_marker = true;
			continue;
		}
		if ( ! $found_marker ) {
			$pre_lines[] = $line;
		} elseif ( $found_marker && $found_end_marker ) {
			$post_lines[] = $line;
		} else {
			$existing_lines[] = $line;
		}
	}

	// Check to see if there was a change.
	if ( $existing_lines === $insertion ) {
		flock( $fp, LOCK_UN );
		fclose( $fp );

		return true;
	}

	// Generate the new file data.
	$new_file_data = implode(
		"\n",
		array_merge(
			$pre_lines,
			array( $start_marker ),
			$insertion,
			array( $end_marker ),
			$post_lines
		)
	);

	// Write to the start of the file, and truncate it to that length.
	fseek( $fp, 0 );
	$bytes = fwrite( $fp, $new_file_data );
	if ( $bytes ) {
		ftruncate( $fp, ftell( $fp ) );
	}
	fflush( $fp );
	flock( $fp, LOCK_UN );
	fclose( $fp );

	return (bool) $bytes;
}

/**
 * Updates the htaccess file with the current rules if it is writable.
 *
 * Always writes to the file if it exists and is writable to ensure that we
 * blank out old rules.
 *
 * @since 1.5.0
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @return bool|null True on write success, false on failure. Null in multisite.
 */
function save_mod_rewrite_rules() {
	if ( is_multisite() ) {
		return;
	}

	global $wp_rewrite;

	// Ensure get_home_path() is declared.
	require_once ABSPATH . 'wp-admin/includes/file.php';

	$home_path     = get_home_path();
	$htaccess_file = $home_path . '.htaccess';

	/*
	 * If the file doesn't already exist check for write access to the directory
	 * and whether we have some rules. Else check for write access to the file.
	 */
	if ( ( ! file_exists( $htaccess_file ) && is_writable( $home_path ) && $wp_rewrite->using_mod_rewrite_permalinks() ) || is_writable( $htaccess_file ) ) {
		if ( got_mod_rewrite() ) {
			$rules = explode( "\n", $wp_rewrite->mod_rewrite_rules() );
			return insert_with_markers( $htaccess_file, 'WordPress', $rules );
		}
	}

	return false;
}

/**
 * Updates the IIS web.config file with the current rules if it is writable.
 * If the permalinks do not require rewrite rules then the rules are deleted from the web.config file.
 *
 * @since 2.8.0
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @return bool|null True on write success, false on failure. Null in multisite.
 */
function iis7_save_url_rewrite_rules() {
	if ( is_multisite() ) {
		return;
	}

	global $wp_rewrite;

	// Ensure get_home_path() is declared.
	require_once ABSPATH . 'wp-admin/includes/file.php';

	$home_path       = get_home_path();
	$web_config_file = $home_path . 'web.config';

	// Using win_is_writable() instead of is_writable() because of a bug in Windows PHP.
	if ( iis7_supports_permalinks() && ( ( ! file_exists( $web_config_file ) && win_is_writable( $home_path ) && $wp_rewrite->using_mod_rewrite_permalinks() ) || win_is_writable( $web_config_file ) ) ) {
		$rule = $wp_rewrite->iis7_url_rewrite_rules( false );
		if ( ! empty( $rule ) ) {
			return iis7_add_rewrite_rule( $web_config_file, $rule );
		} else {
			return iis7_delete_rewrite_rule( $web_config_file );
		}
	}
	return false;
}

/**
 * Update the "recently-edited" file for the plugin or theme editor.
 *
 * @since 1.5.0
 *
 * @param string $file
 */
function update_recently_edited( $file ) {
	$oldfiles = (array) get_option( 'recently_edited' );
	if ( $oldfiles ) {
		$oldfiles   = array_reverse( $oldfiles );
		$oldfiles[] = $file;
		$oldfiles   = array_reverse( $oldfiles );
		$oldfiles   = array_unique( $oldfiles );
		if ( 5 < count( $oldfiles ) ) {
			array_pop( $oldfiles );
		}
	} else {
		$oldfiles[] = $file;
	}
	update_option( 'recently_edited', $oldfiles );
}

/**
 * Makes a tree structure for the theme editor's file list.
 *
 * @since 4.9.0
 * @access private
 *
 * @param array $allowed_files List of theme file paths.
 * @return array Tree structure for listing theme files.
 */
function wp_make_theme_file_tree( $allowed_files ) {
	$tree_list = array();
	foreach ( $allowed_files as $file_name => $absolute_filename ) {
		$list     = explode( '/', $file_name );
		$last_dir = &$tree_list;
		foreach ( $list as $dir ) {
			$last_dir =& $last_dir[ $dir ];
		}
		$last_dir = $file_name;
	}
	return $tree_list;
}

/**
 * Outputs the formatted file list for the theme editor.
 *
 * @since 4.9.0
 * @access private
 *
 * @global string $relative_file Name of the file being edited relative to the
 *                               theme directory.
 * @global string $stylesheet    The stylesheet name of the theme being edited.
 *
 * @param array|string $tree  List of file/folder paths, or filename.
 * @param int          $level The aria-level for the current iteration.
 * @param int          $size  The aria-setsize for the current iteration.
 * @param int          $index The aria-posinset for the current iteration.
 */
function wp_print_theme_file_tree( $tree, $level = 2, $size = 1, $index = 1 ) {
	global $relative_file, $stylesheet;

	if ( is_array( $tree ) ) {
		$index = 0;
		$size  = count( $tree );
		foreach ( $tree as $label => $theme_file ) :
			$index++;
			if ( ! is_array( $theme_file ) ) {
				wp_print_theme_file_tree( $theme_file, $level, $index, $size );
				continue;
			}
			?>
			<li role="treeitem" aria-expanded="true" tabindex="-1"
				aria-level="<?php echo esc_attr( $level ); ?>"
				aria-setsize="<?php echo esc_attr( $size ); ?>"
				aria-posinset="<?php echo esc_attr( $index ); ?>">
				<?php echo esc_html( $label ); ?> <?php _e( 'folder' ); ?>

<?php wp_print_theme_file_tree( $theme_file, $level + 1, $index, $size ); ?>

			<?php
		endforeach;
	} else {
		$filename = $tree;
		$url      = add_query_arg(
			array(
				'file'  => rawurlencode( $tree ),
				'theme' => rawurlencode( $stylesheet ),
			),
			self_admin_url( 'theme-editor.php' )
		);
		?>
		<li role="none" class="<?php echo esc_attr( $relative_file === $filename ? 'current-file' : '' ); ?>">
			<a role="treeitem" tabindex="<?php echo esc_attr( $relative_file === $filename ? '0' : '-1' ); ?>"
				href="<?php echo esc_url( $url ); ?>"
				aria-level="<?php echo esc_attr( $level ); ?>"
				aria-setsize="<?php echo esc_attr( $size ); ?>"
				aria-posinset="<?php echo esc_attr( $index ); ?>">
				<?php
				$file_description = esc_html( get_file_description( $filename ) );
				if ( $file_description !== $filename && wp_basename( $filename ) !== $file_description ) {
					$file_description .= '
(' . esc_html( $filename ) . ')';
				}

				if ( $relative_file === $filename ) {
					echo '' . $file_description . '';
				} else {
					echo $file_description;
				}
				?>

		<?php
	}
}

/**
 * Makes a tree structure for the plugin editor's file list.
 *
 * @since 4.9.0
 * @access private
 *
 * @param array $plugin_editable_files List of plugin file paths.
 * @return array Tree structure for listing plugin files.
 */
function wp_make_plugin_file_tree( $plugin_editable_files ) {
	$tree_list = array();
	foreach ( $plugin_editable_files as $plugin_file ) {
		$list     = explode( '/', preg_replace( '#^.+?/#', '', $plugin_file ) );
		$last_dir = &$tree_list;
		foreach ( $list as $dir ) {
			$last_dir =& $last_dir[ $dir ];
		}
		$last_dir = $plugin_file;
	}
	return $tree_list;
}

/**
 * Outputs the formatted file list for the plugin editor.
 *
 * @since 4.9.0
 * @access private
 *
 * @param array|string $tree  List of file/folder paths, or filename.
 * @param string       $label Name of file or folder to print.
 * @param int          $level The aria-level for the current iteration.
 * @param int          $size  The aria-setsize for the current iteration.
 * @param int          $index The aria-posinset for the current iteration.
 */
function wp_print_plugin_file_tree( $tree, $label = '', $level = 2, $size = 1, $index = 1 ) {
	global $file, $plugin;
	if ( is_array( $tree ) ) {
		$index = 0;
		$size  = count( $tree );
		foreach ( $tree as $label => $plugin_file ) :
			$index++;
			if ( ! is_array( $plugin_file ) ) {
				wp_print_plugin_file_tree( $plugin_file, $label, $level, $index, $size );
				continue;
			}
			?>
			<li role="treeitem" aria-expanded="true" tabindex="-1"
				aria-level="<?php echo esc_attr( $level ); ?>"
				aria-setsize="<?php echo esc_attr( $size ); ?>"
				aria-posinset="<?php echo esc_attr( $index ); ?>">
				<?php echo esc_html( $label ); ?> <?php _e( 'folder' ); ?>

<?php wp_print_plugin_file_tree( $plugin_file, '', $level + 1, $index, $size ); ?>

			<?php
		endforeach;
	} else {
		$url = add_query_arg(
			array(
				'file'   => rawurlencode( $tree ),
				'plugin' => rawurlencode( $plugin ),
			),
			self_admin_url( 'plugin-editor.php' )
		);
		?>
		<li role="none" class="<?php echo esc_attr( $file === $tree ? 'current-file' : '' ); ?>">
			<a role="treeitem" tabindex="<?php echo esc_attr( $file === $tree ? '0' : '-1' ); ?>"
				href="<?php echo esc_url( $url ); ?>"
				aria-level="<?php echo esc_attr( $level ); ?>"
				aria-setsize="<?php echo esc_attr( $size ); ?>"
				aria-posinset="<?php echo esc_attr( $index ); ?>">
				<?php
				if ( $file === $tree ) {
					echo '' . esc_html( $label ) . '';
				} else {
					echo esc_html( $label );
				}
				?>

		<?php
	}
}

/**
 * Flushes rewrite rules if siteurl, home or page_on_front changed.
 *
 * @since 2.1.0
 *
 * @param string $old_value
 * @param string $value
 */
function update_home_siteurl( $old_value, $value ) {
	if ( wp_installing() ) {
		return;
	}

	if ( is_multisite() && ms_is_switched() ) {
		delete_option( 'rewrite_rules' );
	} else {
		flush_rewrite_rules();
	}
}

/**
 * Resets global variables based on $_GET and $_POST
 *
 * This function resets global variables based on the names passed
 * in the $vars array to the value of $_POST[$var] or $_GET[$var] or ''
 * if neither is defined.
 *
 * @since 2.0.0
 *
 * @param array $vars An array of globals to reset.
 */
function wp_reset_vars( $vars ) {
	foreach ( $vars as $var ) {
		if ( empty( $_POST[ $var ] ) ) {
			if ( empty( $_GET[ $var ] ) ) {
				$GLOBALS[ $var ] = '';
			} else {
				$GLOBALS[ $var ] = $_GET[ $var ];
			}
		} else {
			$GLOBALS[ $var ] = $_POST[ $var ];
		}
	}
}

/**
 * Displays the given administration message.
 *
 * @since 2.1.0
 *
 * @param string|WP_Error $message
 */
function show_message( $message ) {
	if ( is_wp_error( $message ) ) {
		if ( $message->get_error_data() && is_string( $message->get_error_data() ) ) {
			$message = $message->get_error_message() . ': ' . $message->get_error_data();
		} else {
			$message = $message->get_error_message();
		}
	}
	echo "
$message
\n";
	wp_ob_end_flush_all();
	flush();
}

/**
 * @since 2.8.0
 *
 * @param string $content
 * @return array
 */
function wp_doc_link_parse( $content ) {
	if ( ! is_string( $content ) || empty( $content ) ) {
		return array();
	}

	if ( ! function_exists( 'token_get_all' ) ) {
		return array();
	}

	$tokens           = token_get_all( $content );
	$count            = count( $tokens );
	$functions        = array();
	$ignore_functions = array();
	for ( $t = 0; $t < $count - 2; $t++ ) {
		if ( ! is_array( $tokens[ $t ] ) ) {
			continue;
		}

		if ( T_STRING == $tokens[ $t ][0] && ( '(' === $tokens[ $t + 1 ] || '(' === $tokens[ $t + 2 ] ) ) {
			// If it's a function or class defined locally, there's not going to be any docs available.
			if ( ( isset( $tokens[ $t - 2 ][1] ) && in_array( $tokens[ $t - 2 ][1], array( 'function', 'class' ), true ) )
				|| ( isset( $tokens[ $t - 2 ][0] ) && T_OBJECT_OPERATOR == $tokens[ $t - 1 ][0] )
			) {
				$ignore_functions[] = $tokens[ $t ][1];
			}
			// Add this to our stack of unique references.
			$functions[] = $tokens[ $t ][1];
		}
	}

	$functions = array_unique( $functions );
	sort( $functions );

	/**
	 * Filters the list of functions and classes to be ignored from the documentation lookup.
	 *
	 * @since 2.8.0
	 *
	 * @param string[] $ignore_functions Array of names of functions and classes to be ignored.
	 */
	$ignore_functions = apply_filters( 'documentation_ignore_functions', $ignore_functions );

	$ignore_functions = array_unique( $ignore_functions );

	$out = array();
	foreach ( $functions as $function ) {
		if ( in_array( $function, $ignore_functions, true ) ) {
			continue;
		}
		$out[] = $function;
	}

	return $out;
}

/**
 * Saves option for number of rows when listing posts, pages, comments, etc.
 *
 * @since 2.8.0
 */
function set_screen_options() {

	if ( isset( $_POST['wp_screen_options'] ) && is_array( $_POST['wp_screen_options'] ) ) {
		check_admin_referer( 'screen-options-nonce', 'screenoptionnonce' );

		$user = wp_get_current_user();
		if ( ! $user ) {
			return;
		}
		$option = $_POST['wp_screen_options']['option'];
		$value  = $_POST['wp_screen_options']['value'];

		if ( sanitize_key( $option ) != $option ) {
			return;
		}

		$map_option = $option;
		$type       = str_replace( 'edit_', '', $map_option );
		$type       = str_replace( '_per_page', '', $type );
		if ( in_array( $type, get_taxonomies(), true ) ) {
			$map_option = 'edit_tags_per_page';
		} elseif ( in_array( $type, get_post_types(), true ) ) {
			$map_option = 'edit_per_page';
		} else {
			$option = str_replace( '-', '_', $option );
		}

		switch ( $map_option ) {
			case 'edit_per_page':
			case 'users_per_page':
			case 'edit_comments_per_page':
			case 'upload_per_page':
			case 'edit_tags_per_page':
			case 'plugins_per_page':
			case 'export_personal_data_requests_per_page':
			case 'remove_personal_data_requests_per_page':
				// Network admin.
			case 'sites_network_per_page':
			case 'users_network_per_page':
			case 'site_users_network_per_page':
			case 'plugins_network_per_page':
			case 'themes_network_per_page':
			case 'site_themes_network_per_page':
				$value = (int) $value;
				if ( $value < 1 || $value > 999 ) {
					return;
				}
				break;
			default:
				$screen_option = false;

				if ( '_page' === substr( $option, -5 ) || 'layout_columns' === $option ) {
					/**
					 * Filters a screen option value before it is set.
					 *
					 * The filter can also be used to modify non-standard [items]_per_page
					 * settings. See the parent function for a full list of standard options.
					 *
					 * Returning false from the filter will skip saving the current option.
					 *
					 * @since 2.8.0
					 * @since 5.4.2 Only applied to options ending with '_page',
					 *              or the 'layout_columns' option.
					 *
					 * @see set_screen_options()
					 *
					 * @param mixed  $screen_option The value to save instead of the option value.
					 *                              Default false (to skip saving the current option).
					 * @param string $option        The option name.
					 * @param int    $value         The option value.
					 */
					$screen_option = apply_filters( 'set-screen-option', $screen_option, $option, $value ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
				}

				/**
				 * Filters a screen option value before it is set.
				 *
				 * The dynamic portion of the hook, `$option`, refers to the option name.
				 *
				 * Returning false from the filter will skip saving the current option.
				 *
				 * @since 5.4.2
				 *
				 * @see set_screen_options()
				 *
				 * @param mixed   $screen_option The value to save instead of the option value.
				 *                               Default false (to skip saving the current option).
				 * @param string  $option        The option name.
				 * @param int     $value         The option value.
				 */
				$value = apply_filters( "set_screen_option_{$option}", $screen_option, $option, $value );

				if ( false === $value ) {
					return;
				}
				break;
		}

		update_user_meta( $user->ID, $option, $value );

		$url = remove_query_arg( array( 'pagenum', 'apage', 'paged' ), wp_get_referer() );
		if ( isset( $_POST['mode'] ) ) {
			$url = add_query_arg( array( 'mode' => $_POST['mode'] ), $url );
		}

		wp_safe_redirect( $url );
		exit;
	}
}

/**
 * Check if rewrite rule for WordPress already exists in the IIS 7+ configuration file
 *
 * @since 2.8.0
 *
 * @return bool
 * @param string $filename The file path to the configuration file
 */
function iis7_rewrite_rule_exists( $filename ) {
	if ( ! file_exists( $filename ) ) {
		return false;
	}
	if ( ! class_exists( 'DOMDocument', false ) ) {
		return false;
	}

	$doc = new DOMDocument();
	if ( $doc->load( $filename ) === false ) {
		return false;
	}
	$xpath = new DOMXPath( $doc );
	$rules = $xpath->query( '/configuration/system.webServer/rewrite/rules/rule[starts-with(@name,\'wordpress\')] | /configuration/system.webServer/rewrite/rules/rule[starts-with(@name,\'WordPress\')]' );
	if ( 0 == $rules->length ) {
		return false;
	} else {
		return true;
	}
}

/**
 * Delete WordPress rewrite rule from web.config file if it exists there
 *
 * @since 2.8.0
 *
 * @param string $filename Name of the configuration file
 * @return bool
 */
function iis7_delete_rewrite_rule( $filename ) {
	// If configuration file does not exist then rules also do not exist, so there is nothing to delete.
	if ( ! file_exists( $filename ) ) {
		return true;
	}

	if ( ! class_exists( 'DOMDocument', false ) ) {
		return false;
	}

	$doc                     = new DOMDocument();
	$doc->preserveWhiteSpace = false;

	if ( $doc->load( $filename ) === false ) {
		return false;
	}
	$xpath = new DOMXPath( $doc );
	$rules = $xpath->query( '/configuration/system.webServer/rewrite/rules/rule[starts-with(@name,\'wordpress\')] | /configuration/system.webServer/rewrite/rules/rule[starts-with(@name,\'WordPress\')]' );
	if ( $rules->length > 0 ) {
		$child  = $rules->item( 0 );
		$parent = $child->parentNode;
		$parent->removeChild( $child );
		$doc->formatOutput = true;
		saveDomDocument( $doc, $filename );
	}
	return true;
}

/**
 * Add WordPress rewrite rule to the IIS 7+ configuration file.
 *
 * @since 2.8.0
 *
 * @param string $filename The file path to the configuration file
 * @param string $rewrite_rule The XML fragment with URL Rewrite rule
 * @return bool
 */
function iis7_add_rewrite_rule( $filename, $rewrite_rule ) {
	if ( ! class_exists( 'DOMDocument', false ) ) {
		return false;
	}

	// If configuration file does not exist then we create one.
	if ( ! file_exists( $filename ) ) {
		$fp = fopen( $filename, 'w' );
		fwrite( $fp, '<configuration/>' );
		fclose( $fp );
	}

	$doc                     = new DOMDocument();
	$doc->preserveWhiteSpace = false;

	if ( $doc->load( $filename ) === false ) {
		return false;
	}

	$xpath = new DOMXPath( $doc );

	// First check if the rule already exists as in that case there is no need to re-add it.
	$wordpress_rules = $xpath->query( '/configuration/system.webServer/rewrite/rules/rule[starts-with(@name,\'wordpress\')] | /configuration/system.webServer/rewrite/rules/rule[starts-with(@name,\'WordPress\')]' );
	if ( $wordpress_rules->length > 0 ) {
		return true;
	}

	// Check the XPath to the rewrite rule and create XML nodes if they do not exist.
	$xmlnodes = $xpath->query( '/configuration/system.webServer/rewrite/rules' );
	if ( $xmlnodes->length > 0 ) {
		$rules_node = $xmlnodes->item( 0 );
	} else {
		$rules_node = $doc->createElement( 'rules' );

		$xmlnodes = $xpath->query( '/configuration/system.webServer/rewrite' );
		if ( $xmlnodes->length > 0 ) {
			$rewrite_node = $xmlnodes->item( 0 );
			$rewrite_node->appendChild( $rules_node );
		} else {
			$rewrite_node = $doc->createElement( 'rewrite' );
			$rewrite_node->appendChild( $rules_node );

			$xmlnodes = $xpath->query( '/configuration/system.webServer' );
			if ( $xmlnodes->length > 0 ) {
				$system_webServer_node = $xmlnodes->item( 0 );
				$system_webServer_node->appendChild( $rewrite_node );
			} else {
				$system_webServer_node = $doc->createElement( 'system.webServer' );
				$system_webServer_node->appendChild( $rewrite_node );

				$xmlnodes = $xpath->query( '/configuration' );
				if ( $xmlnodes->length > 0 ) {
					$config_node = $xmlnodes->item( 0 );
					$config_node->appendChild( $system_webServer_node );
				} else {
					$config_node = $doc->createElement( 'configuration' );
					$doc->appendChild( $config_node );
					$config_node->appendChild( $system_webServer_node );
				}
			}
		}
	}

	$rule_fragment = $doc->createDocumentFragment();
	$rule_fragment->appendXML( $rewrite_rule );
	$rules_node->appendChild( $rule_fragment );

	$doc->encoding     = 'UTF-8';
	$doc->formatOutput = true;
	saveDomDocument( $doc, $filename );

	return true;
}

/**
 * Saves the XML document into a file
 *
 * @since 2.8.0
 *
 * @param DOMDocument $doc
 * @param string      $filename
 */
function saveDomDocument( $doc, $filename ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
	$config = $doc->saveXML();
	$config = preg_replace( "/([^\r])\n/", "$1\r\n", $config );
	$fp     = fopen( $filename, 'w' );
	fwrite( $fp, $config );
	fclose( $fp );
}

/**
 * Display the default admin color scheme picker (Used in user-edit.php)
 *
 * @since 3.0.0
 *
 * @global array $_wp_admin_css_colors
 *
 * @param int $user_id User ID.
 */
function admin_color_scheme_picker( $user_id ) {
	global $_wp_admin_css_colors;

	ksort( $_wp_admin_css_colors );

	if ( isset( $_wp_admin_css_colors['fresh'] ) ) {
		// Set Default ('fresh') and Light should go first.
		$_wp_admin_css_colors = array_filter(
			array_merge(
				array(
					'fresh'  => '',
					'light'  => '',
					'modern' => '',
				),
				$_wp_admin_css_colors
			)
		);
	}

	$current_color = get_user_option( 'admin_color', $user_id );

	if ( empty( $current_color ) || ! isset( $_wp_admin_css_colors[ $current_color ] ) ) {
		$current_color = 'fresh';
	}

	?>
	<fieldset id="color-picker" class="scheme-list">
		<legend class="screen-reader-text"><?php _e( 'Admin Color Scheme' ); ?></legend>
		<?php
		wp_nonce_field( 'save-color-scheme', 'color-nonce', false );
		foreach ( $_wp_admin_css_colors as $color => $color_info ) :

			?>
			<div class="color-option <?php echo ( $color == $current_color ) ? 'selected' : ''; ?>">
				<input name="admin_color" id="admin_color_<?php echo esc_attr( $color ); ?>" type="radio" value="<?php echo esc_attr( $color ); ?>" class="tog" <?php checked( $color, $current_color ); ?> />
				<input type="hidden" class="css_url" value="<?php echo esc_url( $color_info->url ); ?>" />
				<input type="hidden" class="icon_colors" value="<?php echo esc_attr( wp_json_encode( array( 'icons' => $color_info->icon_colors ) ) ); ?>" />
				<label for="admin_color_<?php echo esc_attr( $color ); ?>"><?php echo esc_html( $color_info->name ); ?>

					<?php

					foreach ( $color_info->colors as $html_color ) {
						?>
						<td style="background-color: <?php echo esc_attr( $html_color ); ?>">
						<?php
					}

					?>

			<?php

		endforeach;

		?>
	</fieldset>
	<?php
}

/**
 *
 * @global array $_wp_admin_css_colors
 */
function wp_color_scheme_settings() {
	global $_wp_admin_css_colors;

	$color_scheme = get_user_option( 'admin_color' );

	// It's possible to have a color scheme set that is no longer registered.
	if ( empty( $_wp_admin_css_colors[ $color_scheme ] ) ) {
		$color_scheme = 'fresh';
	}

	if ( ! empty( $_wp_admin_css_colors[ $color_scheme ]->icon_colors ) ) {
		$icon_colors = $_wp_admin_css_colors[ $color_scheme ]->icon_colors;
	} elseif ( ! empty( $_wp_admin_css_colors['fresh']->icon_colors ) ) {
		$icon_colors = $_wp_admin_css_colors['fresh']->icon_colors;
	} else {
		// Fall back to the default set of icon colors if the default scheme is missing.
		$icon_colors = array(
			'base'    => '#a0a5aa',
			'focus'   => '#00a0d2',
			'current' => '#fff',
		);
	}

	echo '\n";
}

/**
 * Displays the viewport meta in the admin.
 *
 * @since 5.5.0
 */
function wp_admin_viewport_meta() {
	/**
	 * Filters the viewport meta in the admin.
	 *
	 * @since 5.5.0
	 *
	 * @param string $viewport_meta The viewport meta.
	 */
	$viewport_meta = apply_filters( 'admin_viewport_meta', 'width=device-width,initial-scale=1.0' );

	if ( empty( $viewport_meta ) ) {
		return;
	}

	echo '<meta name="viewport" content="' . esc_attr( $viewport_meta ) . '">';
}

/**
 * Adds viewport meta for mobile in Customizer.
 *
 * Hooked to the {@see 'admin_viewport_meta'} filter.
 *
 * @since 5.5.0
 *
 * @param string $viewport_meta The viewport meta.
 * @return string Filtered viewport meta.
 */
function _customizer_mobile_viewport_meta( $viewport_meta ) {
	return trim( $viewport_meta, ',' ) . ',minimum-scale=0.5,maximum-scale=1.2';
}

/**
 * Check lock status for posts displayed on the Posts screen
 *
 * @since 3.6.0
 *
 * @param array  $response  The Heartbeat response.
 * @param array  $data      The $_POST data sent.
 * @param string $screen_id The screen ID.
 * @return array The Heartbeat response.
 */
function wp_check_locked_posts( $response, $data, $screen_id ) {
	$checked = array();

	if ( array_key_exists( 'wp-check-locked-posts', $data ) && is_array( $data['wp-check-locked-posts'] ) ) {
		foreach ( $data['wp-check-locked-posts'] as $key ) {
			$post_id = absint( substr( $key, 5 ) );
			if ( ! $post_id ) {
				continue;
			}

			$user_id = wp_check_post_lock( $post_id );
			if ( $user_id ) {
				$user = get_userdata( $user_id );
				if ( $user && current_user_can( 'edit_post', $post_id ) ) {
					$send = array(
						/* translators: %s: User's display name. */
						'text' => sprintf( __( '%s is currently editing' ), $user->display_name ),
					);

					if ( get_option( 'show_avatars' ) ) {
						$send['avatar_src']    = get_avatar_url( $user->ID, array( 'size' => 18 ) );
						$send['avatar_src_2x'] = get_avatar_url( $user->ID, array( 'size' => 36 ) );
					}

					$checked[ $key ] = $send;
				}
			}
		}
	}

	if ( ! empty( $checked ) ) {
		$response['wp-check-locked-posts'] = $checked;
	}

	return $response;
}

/**
 * Check lock status on the New/Edit Post screen and refresh the lock
 *
 * @since 3.6.0
 *
 * @param array  $response  The Heartbeat response.
 * @param array  $data      The $_POST data sent.
 * @param string $screen_id The screen ID.
 * @return array The Heartbeat response.
 */
function wp_refresh_post_lock( $response, $data, $screen_id ) {
	if ( array_key_exists( 'wp-refresh-post-lock', $data ) ) {
		$received = $data['wp-refresh-post-lock'];
		$send     = array();

		$post_id = absint( $received['post_id'] );
		if ( ! $post_id ) {
			return $response;
		}

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return $response;
		}

		$user_id = wp_check_post_lock( $post_id );
		$user    = get_userdata( $user_id );
		if ( $user ) {
			$error = array(
				/* translators: %s: User's display name. */
				'text' => sprintf( __( '%s has taken over and is currently editing.' ), $user->display_name ),
			);

			if ( get_option( 'show_avatars' ) ) {
				$error['avatar_src']    = get_avatar_url( $user->ID, array( 'size' => 64 ) );
				$error['avatar_src_2x'] = get_avatar_url( $user->ID, array( 'size' => 128 ) );
			}

			$send['lock_error'] = $error;
		} else {
			$new_lock = wp_set_post_lock( $post_id );
			if ( $new_lock ) {
				$send['new_lock'] = implode( ':', $new_lock );
			}
		}

		$response['wp-refresh-post-lock'] = $send;
	}

	return $response;
}

/**
 * Check nonce expiration on the New/Edit Post screen and refresh if needed
 *
 * @since 3.6.0
 *
 * @param array  $response  The Heartbeat response.
 * @param array  $data      The $_POST data sent.
 * @param string $screen_id The screen ID.
 * @return array The Heartbeat response.
 */
function wp_refresh_post_nonces( $response, $data, $screen_id ) {
	if ( array_key_exists( 'wp-refresh-post-nonces', $data ) ) {
		$received                           = $data['wp-refresh-post-nonces'];
		$response['wp-refresh-post-nonces'] = array( 'check' => 1 );

		$post_id = absint( $received['post_id'] );
		if ( ! $post_id ) {
			return $response;
		}

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return $response;
		}

		$response['wp-refresh-post-nonces'] = array(
			'replace' => array(
				'getpermalinknonce'    => wp_create_nonce( 'getpermalink' ),
				'samplepermalinknonce' => wp_create_nonce( 'samplepermalink' ),
				'closedpostboxesnonce' => wp_create_nonce( 'closedpostboxes' ),
				'_ajax_linking_nonce'  => wp_create_nonce( 'internal-linking' ),
				'_wpnonce'             => wp_create_nonce( 'update-post_' . $post_id ),
			),
		);
	}

	return $response;
}

/**
 * Add the latest Heartbeat and REST-API nonce to the Heartbeat response.
 *
 * @since 5.0.0
 *
 * @param array $response The Heartbeat response.
 * @return array The Heartbeat response.
 */
function wp_refresh_heartbeat_nonces( $response ) {
	// Refresh the Rest API nonce.
	$response['rest_nonce'] = wp_create_nonce( 'wp_rest' );

	// Refresh the Heartbeat nonce.
	$response['heartbeat_nonce'] = wp_create_nonce( 'heartbeat-nonce' );
	return $response;
}

/**
 * Disable suspension of Heartbeat on the Add/Edit Post screens.
 *
 * @since 3.8.0
 *
 * @global string $pagenow
 *
 * @param array $settings An array of Heartbeat settings.
 * @return array Filtered Heartbeat settings.
 */
function wp_heartbeat_set_suspension( $settings ) {
	global $pagenow;

	if ( 'post.php' === $pagenow || 'post-new.php' === $pagenow ) {
		$settings['suspension'] = 'disable';
	}

	return $settings;
}

/**
 * Autosave with heartbeat
 *
 * @since 3.9.0
 *
 * @param array $response The Heartbeat response.
 * @param array $data     The $_POST data sent.
 * @return array The Heartbeat response.
 */
function heartbeat_autosave( $response, $data ) {
	if ( ! empty( $data['wp_autosave'] ) ) {
		$saved = wp_autosave( $data['wp_autosave'] );

		if ( is_wp_error( $saved ) ) {
			$response['wp_autosave'] = array(
				'success' => false,
				'message' => $saved->get_error_message(),
			);
		} elseif ( empty( $saved ) ) {
			$response['wp_autosave'] = array(
				'success' => false,
				'message' => __( 'Error while saving.' ),
			);
		} else {
			/* translators: Draft saved date format, see https://www.php.net/date */
			$draft_saved_date_format = __( 'g:i:s a' );
			$response['wp_autosave'] = array(
				'success' => true,
				/* translators: %s: Date and time. */
				'message' => sprintf( __( 'Draft saved at %s.' ), date_i18n( $draft_saved_date_format ) ),
			);
		}
	}

	return $response;
}

/**
 * Remove single-use URL parameters and create canonical link based on new URL.
 *
 * Remove specific query string parameters from a URL, create the canonical link,
 * put it in the admin header, and change the current URL to match.
 *
 * @since 4.2.0
 */
function wp_admin_canonical_url() {
	$removable_query_args = wp_removable_query_args();

	if ( empty( $removable_query_args ) ) {
		return;
	}

	// Ensure we're using an absolute URL.
	$current_url  = set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
	$filtered_url = remove_query_arg( $removable_query_args, $current_url );
	?>
	<link id="wp-admin-canonical" rel="canonical" href="<?php echo esc_url( $filtered_url ); ?>" />

	<?php
}

/**
 * Send a referrer policy header so referrers are not sent externally from administration screens.
 *
 * @since 4.9.0
 */
function wp_admin_headers() {
	$policy = 'strict-origin-when-cross-origin';

	/**
	 * Filters the admin referrer policy header value.
	 *
	 * @since 4.9.0
	 * @since 4.9.5 The default value was changed to 'strict-origin-when-cross-origin'.
	 *
	 * @link https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
	 *
	 * @param string $policy The admin referrer policy header value. Default 'strict-origin-when-cross-origin'.
	 */
	$policy = apply_filters( 'admin_referrer_policy', $policy );

	header( sprintf( 'Referrer-Policy: %s', $policy ) );
}

/**
 * Outputs JS that reloads the page if the user navigated to it with the Back or Forward button.
 *
 * Used on the Edit Post and Add New Post screens. Needed to ensure the page is not loaded from browser cache,
 * so the post title and editor content are the last saved versions. Ideally this script should run first in the head.
 *
 * @since 4.6.0
 */
function wp_page_reload_on_back_button_js() {
	?>

	<?php
}

/**
 * Send a confirmation request email when a change of site admin email address is attempted.
 *
 * The new site admin address will not become active until confirmed.
 *
 * @since 3.0.0
 * @since 4.9.0 This function was moved from wp-admin/includes/ms.php so it's no longer Multisite specific.
 *
 * @param string $old_value The old site admin email address.
 * @param string $value     The proposed new site admin email address.
 */
function update_option_new_admin_email( $old_value, $value ) {
	if ( get_option( 'admin_email' ) === $value || ! is_email( $value ) ) {
		return;
	}

	$hash            = md5( $value . time() . wp_rand() );
	$new_admin_email = array(
		'hash'     => $hash,
		'newemail' => $value,
	);
	update_option( 'adminhash', $new_admin_email );

	$switched_locale = switch_to_locale( get_user_locale() );

	/* translators: Do not translate USERNAME, ADMIN_URL, EMAIL, SITENAME, SITEURL: those are placeholders. */
	$email_text = __(
		'Howdy ###USERNAME###,

You recently requested to have the administration email address on
your site changed.

If this is correct, please click on the following link to change it:
###ADMIN_URL###

You can safely ignore and delete this email if you do not want to
take this action.

This email has been sent to ###EMAIL###

Regards,
All at ###SITENAME###
###SITEURL###'
	);

	/**
	 * Filters the text of the email sent when a change of site admin email address is attempted.
	 *
	 * The following strings have a special meaning and will get replaced dynamically:
	 * ###USERNAME###  The current user's username.
	 * ###ADMIN_URL### The link to click on to confirm the email change.
	 * ###EMAIL###     The proposed new site admin email address.
	 * ###SITENAME###  The name of the site.
	 * ###SITEURL###   The URL to the site.
	 *
	 * @since MU (3.0.0)
	 * @since 4.9.0 This filter is no longer Multisite specific.
	 *
	 * @param string $email_text      Text in the email.
	 * @param array  $new_admin_email {
	 *     Data relating to the new site admin email address.
	 *
	 *     @type string $hash     The secure hash used in the confirmation link URL.
	 *     @type string $newemail The proposed new site admin email address.
	 * }
	 */
	$content = apply_filters( 'new_admin_email_content', $email_text, $new_admin_email );

	$current_user = wp_get_current_user();
	$content      = str_replace( '###USERNAME###', $current_user->user_login, $content );
	$content      = str_replace( '###ADMIN_URL###', esc_url( self_admin_url( 'options.php?adminhash=' . $hash ) ), $content );
	$content      = str_replace( '###EMAIL###', $value, $content );
	$content      = str_replace( '###SITENAME###', wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ), $content );
	$content      = str_replace( '###SITEURL###', home_url(), $content );

	wp_mail(
		$value,
		sprintf(
			/* translators: New admin email address notification email subject. %s: Site title. */
			__( '[%s] New Admin Email Address' ),
			wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES )
		),
		$content
	);

	if ( $switched_locale ) {
		restore_previous_locale();
	}
}

/**
 * Appends '(Draft)' to draft page titles in the privacy page dropdown
 * so that unpublished content is obvious.
 *
 * @since 4.9.8
 * @access private
 *
 * @param string  $title Page title.
 * @param WP_Post $page  Page data object.
 * @return string Page title.
 */
function _wp_privacy_settings_filter_draft_page_titles( $title, $page ) {
	if ( 'draft' === $page->post_status && 'privacy' === get_current_screen()->id ) {
		/* translators: %s: Page title. */
		$title = sprintf( __( '%s (Draft)' ), $title );
	}

	return $title;
}

/**
 * Checks if the user needs to update PHP.
 *
 * @since 5.1.0
 * @since 5.1.1 Added the {@see 'wp_is_php_version_acceptable'} filter.
 *
 * @return array|false Array of PHP version data. False on failure.
 */
function wp_check_php_version() {
	$version = phpversion();
	$key     = md5( $version );

	$response = get_site_transient( 'php_check_' . $key );
	if ( false === $response ) {
		$url = 'http://api.wordpress.org/core/serve-happy/1.0/';
		if ( wp_http_supports( array( 'ssl' ) ) ) {
			$url = set_url_scheme( $url, 'https' );
		}

		$url = add_query_arg( 'php_version', $version, $url );

		$response = wp_remote_get( $url );

		if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) {
			return false;
		}

		/**
		 * Response should be an array with:
		 *  'recommended_version' - string - The PHP version recommended by WordPress.
		 *  'is_supported' - boolean - Whether the PHP version is actively supported.
		 *  'is_secure' - boolean - Whether the PHP version receives security updates.
		 *  'is_acceptable' - boolean - Whether the PHP version is still acceptable for WordPress.
		 */
		$response = json_decode( wp_remote_retrieve_body( $response ), true );

		if ( ! is_array( $response ) ) {
			return false;
		}

		set_site_transient( 'php_check_' . $key, $response, WEEK_IN_SECONDS );
	}

	if ( isset( $response['is_acceptable'] ) && $response['is_acceptable'] ) {
		/**
		 * Filters whether the active PHP version is considered acceptable by WordPress.
		 *
		 * Returning false will trigger a PHP version warning to show up in the admin dashboard to administrators.
		 *
		 * This filter is only run if the wordpress.org Serve Happy API considers the PHP version acceptable, ensuring
		 * that this filter can only make this check stricter, but not loosen it.
		 *
		 * @since 5.1.1
		 *
		 * @param bool   $is_acceptable Whether the PHP version is considered acceptable. Default true.
		 * @param string $version       PHP version checked.
		 */
		$response['is_acceptable'] = (bool) apply_filters( 'wp_is_php_version_acceptable', true, $version );
	}

	return $response;
}


<?php
/**
 * Multisite Administration hooks
 *
 * @package WordPress
 * @subpackage Administration
 * @since 4.3.0
 */

// Media hooks.
add_filter( 'wp_handle_upload_prefilter', 'check_upload_size' );

// User hooks.
add_action( 'user_admin_notices', 'new_user_email_admin_notice' );
add_action( 'network_admin_notices', 'new_user_email_admin_notice' );

add_action( 'admin_page_access_denied', '_access_denied_splash', 99 );

// Site hooks.
add_action( 'wpmueditblogaction', 'upload_space_setting' );

// Network hooks.
add_action( 'update_site_option_admin_email', 'wp_network_admin_email_change_notification', 10, 4 );

// Taxonomy hooks.
add_filter( 'get_term', 'sync_category_tag_slugs', 10, 2 );

// Post hooks.
add_filter( 'wp_insert_post_data', 'avoid_blog_page_permalink_collision', 10, 2 );

// Tools hooks.
add_filter( 'import_allow_create_users', 'check_import_new_users' );

// Notices hooks.
add_action( 'admin_notices', 'site_admin_notice' );
add_action( 'network_admin_notices', 'site_admin_notice' );

// Update hooks.
add_action( 'network_admin_notices', 'update_nag', 3 );
add_action( 'network_admin_notices', 'maintenance_nag', 10 );

// Network Admin hooks.
add_action( 'add_site_option_new_admin_email', 'update_network_option_new_admin_email', 10, 2 );
add_action( 'update_site_option_new_admin_email', 'update_network_option_new_admin_email', 10, 2 );


<?php
/**
 * Multisite: Deprecated admin functions from past versions and WordPress MU
 *
 * These functions should not be used and will be removed in a later version.
 * It is suggested to use for the alternatives instead when available.
 *
 * @package WordPress
 * @subpackage Deprecated
 * @since 3.0.0
 */

/**
 * Outputs the WPMU menu.
 *
 * @deprecated 3.0.0
 */
function wpmu_menu() {
	_deprecated_function( __FUNCTION__, '3.0.0' );
	// Deprecated. See #11763.
}

/**
 * Determines if the available space defined by the admin has been exceeded by the user.
 *
 * @deprecated 3.0.0 Use is_upload_space_available()
 * @see is_upload_space_available()
 */
function wpmu_checkAvailableSpace() {
	_deprecated_function( __FUNCTION__, '3.0.0', 'is_upload_space_available()' );

	if ( ! is_upload_space_available() ) {
		wp_die( sprintf(
			/* translators: %s: Allowed space allocation. */
			__( 'Sorry, you have used your space allocation of %s. Please delete some files to upload more files.' ),
			size_format( get_space_allowed() * MB_IN_BYTES )
		) );
	}
}

/**
 * WPMU options.
 *
 * @deprecated 3.0.0
 */
function mu_options( $options ) {
	_deprecated_function( __FUNCTION__, '3.0.0' );
	return $options;
}

/**
 * Deprecated functionality for activating a network-only plugin.
 *
 * @deprecated 3.0.0 Use activate_plugin()
 * @see activate_plugin()
 */
function activate_sitewide_plugin() {
	_deprecated_function( __FUNCTION__, '3.0.0', 'activate_plugin()' );
	return false;
}

/**
 * Deprecated functionality for deactivating a network-only plugin.
 *
 * @deprecated 3.0.0 Use deactivate_plugin()
 * @see deactivate_plugin()
 */
function deactivate_sitewide_plugin( $plugin = false ) {
	_deprecated_function( __FUNCTION__, '3.0.0', 'deactivate_plugin()' );
}

/**
 * Deprecated functionality for determining if the current plugin is network-only.
 *
 * @deprecated 3.0.0 Use is_network_only_plugin()
 * @see is_network_only_plugin()
 */
function is_wpmu_sitewide_plugin( $file ) {
	_deprecated_function( __FUNCTION__, '3.0.0', 'is_network_only_plugin()' );
	return is_network_only_plugin( $file );
}

/**
 * Deprecated functionality for getting themes network-enabled themes.
 *
 * @deprecated 3.4.0 Use WP_Theme::get_allowed_on_network()
 * @see WP_Theme::get_allowed_on_network()
 */
function get_site_allowed_themes() {
	_deprecated_function( __FUNCTION__, '3.4.0', 'WP_Theme::get_allowed_on_network()' );
	return array_map( 'intval', WP_Theme::get_allowed_on_network() );
}

/**
 * Deprecated functionality for getting themes allowed on a specific site.
 *
 * @deprecated 3.4.0 Use WP_Theme::get_allowed_on_site()
 * @see WP_Theme::get_allowed_on_site()
 */
function wpmu_get_blog_allowedthemes( $blog_id = 0 ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'WP_Theme::get_allowed_on_site()' );
	return array_map( 'intval', WP_Theme::get_allowed_on_site( $blog_id ) );
}

/**
 * Deprecated functionality for determining whether a file is deprecated.
 *
 * @deprecated 3.5.0
 */
function ms_deprecated_blogs_file() {}


<?php
/**
 * Multisite administration functions.
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.0.0
 */

/**
 * Determine if uploaded file exceeds space quota.
 *
 * @since 3.0.0
 *
 * @param array $file $_FILES array for a given file.
 * @return array $_FILES array with 'error' key set if file exceeds quota. 'error' is empty otherwise.
 */
function check_upload_size( $file ) {
	if ( get_site_option( 'upload_space_check_disabled' ) ) {
		return $file;
	}

	if ( '0' != $file['error'] ) { // There's already an error.
		return $file;
	}

	if ( defined( 'WP_IMPORTING' ) ) {
		return $file;
	}

	$space_left = get_upload_space_available();

	$file_size = filesize( $file['tmp_name'] );
	if ( $space_left < $file_size ) {
		/* translators: %s: Required disk space in kilobytes. */
		$file['error'] = sprintf( __( 'Not enough space to upload. %s KB needed.' ), number_format( ( $file_size - $space_left ) / KB_IN_BYTES ) );
	}

	if ( $file_size > ( KB_IN_BYTES * get_site_option( 'fileupload_maxk', 1500 ) ) ) {
		/* translators: %s: Maximum allowed file size in kilobytes. */
		$file['error'] = sprintf( __( 'This file is too big. Files must be less than %s KB in size.' ), get_site_option( 'fileupload_maxk', 1500 ) );
	}

	if ( upload_is_user_over_quota( false ) ) {
		$file['error'] = __( 'You have used your space quota. Please delete files before uploading.' );
	}

	if ( '0' != $file['error'] && ! isset( $_POST['html-upload'] ) && ! wp_doing_ajax() ) {
		wp_die( $file['error'] . ' ' . __( 'Back' ) . '' );
	}

	return $file;
}

/**
 * Delete a site.
 *
 * @since 3.0.0
 * @since 5.1.0 Use wp_delete_site() internally to delete the site row from the database.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int  $blog_id Site ID.
 * @param bool $drop    True if site's database tables should be dropped. Default false.
 */
function wpmu_delete_blog( $blog_id, $drop = false ) {
	global $wpdb;

	$switch = false;
	if ( get_current_blog_id() != $blog_id ) {
		$switch = true;
		switch_to_blog( $blog_id );
	}

	$blog = get_site( $blog_id );

	$current_network = get_network();

	// If a full blog object is not available, do not destroy anything.
	if ( $drop && ! $blog ) {
		$drop = false;
	}

	// Don't destroy the initial, main, or root blog.
	if ( $drop && ( 1 == $blog_id || is_main_site( $blog_id ) || ( $blog->path == $current_network->path && $blog->domain == $current_network->domain ) ) ) {
		$drop = false;
	}

	$upload_path = trim( get_option( 'upload_path' ) );

	// If ms_files_rewriting is enabled and upload_path is empty, wp_upload_dir is not reliable.
	if ( $drop && get_site_option( 'ms_files_rewriting' ) && empty( $upload_path ) ) {
		$drop = false;
	}

	if ( $drop ) {
		wp_delete_site( $blog_id );
	} else {
		/** This action is documented in wp-includes/ms-blogs.php */
		do_action_deprecated( 'delete_blog', array( $blog_id, false ), '5.1.0' );

		$users = get_users(
			array(
				'blog_id' => $blog_id,
				'fields'  => 'ids',
			)
		);

		// Remove users from this blog.
		if ( ! empty( $users ) ) {
			foreach ( $users as $user_id ) {
				remove_user_from_blog( $user_id, $blog_id );
			}
		}

		update_blog_status( $blog_id, 'deleted', 1 );

		/** This action is documented in wp-includes/ms-blogs.php */
		do_action_deprecated( 'deleted_blog', array( $blog_id, false ), '5.1.0' );
	}

	if ( $switch ) {
		restore_current_blog();
	}
}

/**
 * Delete a user from the network and remove from all sites.
 *
 * @since 3.0.0
 *
 * @todo Merge with wp_delete_user()?
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $id The user ID.
 * @return bool True if the user was deleted, otherwise false.
 */
function wpmu_delete_user( $id ) {
	global $wpdb;

	if ( ! is_numeric( $id ) ) {
		return false;
	}

	$id   = (int) $id;
	$user = new WP_User( $id );

	if ( ! $user->exists() ) {
		return false;
	}

	// Global super-administrators are protected, and cannot be deleted.
	$_super_admins = get_super_admins();
	if ( in_array( $user->user_login, $_super_admins, true ) ) {
		return false;
	}

	/**
	 * Fires before a user is deleted from the network.
	 *
	 * @since MU (3.0.0)
	 * @since 5.5.0 Added the `$user` parameter.
	 *
	 * @param int     $id   ID of the user about to be deleted from the network.
	 * @param WP_User $user WP_User object of the user about to be deleted from the network.
	 */
	do_action( 'wpmu_delete_user', $id, $user );

	$blogs = get_blogs_of_user( $id );

	if ( ! empty( $blogs ) ) {
		foreach ( $blogs as $blog ) {
			switch_to_blog( $blog->userblog_id );
			remove_user_from_blog( $id, $blog->userblog_id );

			$post_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_author = %d", $id ) );
			foreach ( (array) $post_ids as $post_id ) {
				wp_delete_post( $post_id );
			}

			// Clean links.
			$link_ids = $wpdb->get_col( $wpdb->prepare( "SELECT link_id FROM $wpdb->links WHERE link_owner = %d", $id ) );

			if ( $link_ids ) {
				foreach ( $link_ids as $link_id ) {
					wp_delete_link( $link_id );
				}
			}

			restore_current_blog();
		}
	}

	$meta = $wpdb->get_col( $wpdb->prepare( "SELECT umeta_id FROM $wpdb->usermeta WHERE user_id = %d", $id ) );
	foreach ( $meta as $mid ) {
		delete_metadata_by_mid( 'user', $mid );
	}

	$wpdb->delete( $wpdb->users, array( 'ID' => $id ) );

	clean_user_cache( $user );

	/** This action is documented in wp-admin/includes/user.php */
	do_action( 'deleted_user', $id, null, $user );

	return true;
}

/**
 * Check whether a site has used its allotted upload space.
 *
 * @since MU (3.0.0)
 *
 * @param bool $echo Optional. If $echo is set and the quota is exceeded, a warning message is echoed. Default is true.
 * @return bool True if user is over upload space quota, otherwise false.
 */
function upload_is_user_over_quota( $echo = true ) {
	if ( get_site_option( 'upload_space_check_disabled' ) ) {
		return false;
	}

	$space_allowed = get_space_allowed();
	if ( ! is_numeric( $space_allowed ) ) {
		$space_allowed = 10; // Default space allowed is 10 MB.
	}
	$space_used = get_space_used();

	if ( ( $space_allowed - $space_used ) < 0 ) {
		if ( $echo ) {
			printf(
				/* translators: %s: Allowed space allocation. */
				__( 'Sorry, you have used your space allocation of %s. Please delete some files to upload more files.' ),
				size_format( $space_allowed * MB_IN_BYTES )
			);
		}
		return true;
	} else {
		return false;
	}
}

/**
 * Displays the amount of disk space used by the current site. Not used in core.
 *
 * @since MU (3.0.0)
 */
function display_space_usage() {
	$space_allowed = get_space_allowed();
	$space_used    = get_space_used();

	$percent_used = ( $space_used / $space_allowed ) * 100;

	$space = size_format( $space_allowed * MB_IN_BYTES );
	?>

	<?php
		/* translators: Storage space that's been used. 1: Percentage of used space, 2: Total space allowed in megabytes or gigabytes. */
		printf( __( 'Used: %1$s%% of %2$s' ), number_format( $percent_used ), $space );
	?>

	<?php
}

/**
 * Get the remaining upload space for this site.
 *
 * @since MU (3.0.0)
 *
 * @param int $size Current max size in bytes
 * @return int Max size in bytes
 */
function fix_import_form_size( $size ) {
	if ( upload_is_user_over_quota( false ) ) {
		return 0;
	}
	$available = get_upload_space_available();
	return min( $size, $available );
}

/**
 * Displays the site upload space quota setting form on the Edit Site Settings screen.
 *
 * @since 3.0.0
 *
 * @param int $id The ID of the site to display the setting for.
 */
function upload_space_setting( $id ) {
	switch_to_blog( $id );
	$quota = get_option( 'blog_upload_space' );
	restore_current_blog();

	if ( ! $quota ) {
		$quota = '';
	}

	?>

		<?php _e( 'Site Upload Space Quota' ); ?>

			<input type="number" step="1" min="0" style="width: 100px" name="option[blog_upload_space]" id="blog-upload-space-number" aria-describedby="blog-upload-space-desc" value="<?php echo $quota; ?>" />
			<?php _e( 'Size in megabytes' ); ?> <?php _e( 'MB (Leave blank for network default)' ); ?>

	<?php
}

/**
 * Cleans the user cache for a specific user.
 *
 * @since 3.0.0
 *
 * @param int $id The user ID.
 * @return bool|int The ID of the refreshed user or false if the user does not exist.
 */
function refresh_user_details( $id ) {
	$id = (int) $id;

	$user = get_userdata( $id );
	if ( ! $user ) {
		return false;
	}

	clean_user_cache( $user );

	return $id;
}

/**
 * Returns the language for a language code.
 *
 * @since 3.0.0
 *
 * @param string $code Optional. The two-letter language code. Default empty.
 * @return string The language corresponding to $code if it exists. If it does not exist,
 *                then the first two letters of $code is returned.
 */
function format_code_lang( $code = '' ) {
	$code       = strtolower( substr( $code, 0, 2 ) );
	$lang_codes = array(
		'aa' => 'Afar',
		'ab' => 'Abkhazian',
		'af' => 'Afrikaans',
		'ak' => 'Akan',
		'sq' => 'Albanian',
		'am' => 'Amharic',
		'ar' => 'Arabic',
		'an' => 'Aragonese',
		'hy' => 'Armenian',
		'as' => 'Assamese',
		'av' => 'Avaric',
		'ae' => 'Avestan',
		'ay' => 'Aymara',
		'az' => 'Azerbaijani',
		'ba' => 'Bashkir',
		'bm' => 'Bambara',
		'eu' => 'Basque',
		'be' => 'Belarusian',
		'bn' => 'Bengali',
		'bh' => 'Bihari',
		'bi' => 'Bislama',
		'bs' => 'Bosnian',
		'br' => 'Breton',
		'bg' => 'Bulgarian',
		'my' => 'Burmese',
		'ca' => 'Catalan; Valencian',
		'ch' => 'Chamorro',
		'ce' => 'Chechen',
		'zh' => 'Chinese',
		'cu' => 'Church Slavic; Old Slavonic; Church Slavonic; Old Bulgarian; Old Church Slavonic',
		'cv' => 'Chuvash',
		'kw' => 'Cornish',
		'co' => 'Corsican',
		'cr' => 'Cree',
		'cs' => 'Czech',
		'da' => 'Danish',
		'dv' => 'Divehi; Dhivehi; Maldivian',
		'nl' => 'Dutch; Flemish',
		'dz' => 'Dzongkha',
		'en' => 'English',
		'eo' => 'Esperanto',
		'et' => 'Estonian',
		'ee' => 'Ewe',
		'fo' => 'Faroese',
		'fj' => 'Fijjian',
		'fi' => 'Finnish',
		'fr' => 'French',
		'fy' => 'Western Frisian',
		'ff' => 'Fulah',
		'ka' => 'Georgian',
		'de' => 'German',
		'gd' => 'Gaelic; Scottish Gaelic',
		'ga' => 'Irish',
		'gl' => 'Galician',
		'gv' => 'Manx',
		'el' => 'Greek, Modern',
		'gn' => 'Guarani',
		'gu' => 'Gujarati',
		'ht' => 'Haitian; Haitian Creole',
		'ha' => 'Hausa',
		'he' => 'Hebrew',
		'hz' => 'Herero',
		'hi' => 'Hindi',
		'ho' => 'Hiri Motu',
		'hu' => 'Hungarian',
		'ig' => 'Igbo',
		'is' => 'Icelandic',
		'io' => 'Ido',
		'ii' => 'Sichuan Yi',
		'iu' => 'Inuktitut',
		'ie' => 'Interlingue',
		'ia' => 'Interlingua (International Auxiliary Language Association)',
		'id' => 'Indonesian',
		'ik' => 'Inupiaq',
		'it' => 'Italian',
		'jv' => 'Javanese',
		'ja' => 'Japanese',
		'kl' => 'Kalaallisut; Greenlandic',
		'kn' => 'Kannada',
		'ks' => 'Kashmiri',
		'kr' => 'Kanuri',
		'kk' => 'Kazakh',
		'km' => 'Central Khmer',
		'ki' => 'Kikuyu; Gikuyu',
		'rw' => 'Kinyarwanda',
		'ky' => 'Kirghiz; Kyrgyz',
		'kv' => 'Komi',
		'kg' => 'Kongo',
		'ko' => 'Korean',
		'kj' => 'Kuanyama; Kwanyama',
		'ku' => 'Kurdish',
		'lo' => 'Lao',
		'la' => 'Latin',
		'lv' => 'Latvian',
		'li' => 'Limburgan; Limburger; Limburgish',
		'ln' => 'Lingala',
		'lt' => 'Lithuanian',
		'lb' => 'Luxembourgish; Letzeburgesch',
		'lu' => 'Luba-Katanga',
		'lg' => 'Ganda',
		'mk' => 'Macedonian',
		'mh' => 'Marshallese',
		'ml' => 'Malayalam',
		'mi' => 'Maori',
		'mr' => 'Marathi',
		'ms' => 'Malay',
		'mg' => 'Malagasy',
		'mt' => 'Maltese',
		'mo' => 'Moldavian',
		'mn' => 'Mongolian',
		'na' => 'Nauru',
		'nv' => 'Navajo; Navaho',
		'nr' => 'Ndebele, South; South Ndebele',
		'nd' => 'Ndebele, North; North Ndebele',
		'ng' => 'Ndonga',
		'ne' => 'Nepali',
		'nn' => 'Norwegian Nynorsk; Nynorsk, Norwegian',
		'nb' => 'BokmÃ¥l, Norwegian, Norwegian BokmÃ¥l',
		'no' => 'Norwegian',
		'ny' => 'Chichewa; Chewa; Nyanja',
		'oc' => 'Occitan, ProvenÃ§al',
		'oj' => 'Ojibwa',
		'or' => 'Oriya',
		'om' => 'Oromo',
		'os' => 'Ossetian; Ossetic',
		'pa' => 'Panjabi; Punjabi',
		'fa' => 'Persian',
		'pi' => 'Pali',
		'pl' => 'Polish',
		'pt' => 'Portuguese',
		'ps' => 'Pushto',
		'qu' => 'Quechua',
		'rm' => 'Romansh',
		'ro' => 'Romanian',
		'rn' => 'Rundi',
		'ru' => 'Russian',
		'sg' => 'Sango',
		'sa' => 'Sanskrit',
		'sr' => 'Serbian',
		'hr' => 'Croatian',
		'si' => 'Sinhala; Sinhalese',
		'sk' => 'Slovak',
		'sl' => 'Slovenian',
		'se' => 'Northern Sami',
		'sm' => 'Samoan',
		'sn' => 'Shona',
		'sd' => 'Sindhi',
		'so' => 'Somali',
		'st' => 'Sotho, Southern',
		'es' => 'Spanish; Castilian',
		'sc' => 'Sardinian',
		'ss' => 'Swati',
		'su' => 'Sundanese',
		'sw' => 'Swahili',
		'sv' => 'Swedish',
		'ty' => 'Tahitian',
		'ta' => 'Tamil',
		'tt' => 'Tatar',
		'te' => 'Telugu',
		'tg' => 'Tajik',
		'tl' => 'Tagalog',
		'th' => 'Thai',
		'bo' => 'Tibetan',
		'ti' => 'Tigrinya',
		'to' => 'Tonga (Tonga Islands)',
		'tn' => 'Tswana',
		'ts' => 'Tsonga',
		'tk' => 'Turkmen',
		'tr' => 'Turkish',
		'tw' => 'Twi',
		'ug' => 'Uighur; Uyghur',
		'uk' => 'Ukrainian',
		'ur' => 'Urdu',
		'uz' => 'Uzbek',
		've' => 'Venda',
		'vi' => 'Vietnamese',
		'vo' => 'VolapÃ¼k',
		'cy' => 'Welsh',
		'wa' => 'Walloon',
		'wo' => 'Wolof',
		'xh' => 'Xhosa',
		'yi' => 'Yiddish',
		'yo' => 'Yoruba',
		'za' => 'Zhuang; Chuang',
		'zu' => 'Zulu',
	);

	/**
	 * Filters the language codes.
	 *
	 * @since MU (3.0.0)
	 *
	 * @param string[] $lang_codes Array of key/value pairs of language codes where key is the short version.
	 * @param string   $code       A two-letter designation of the language.
	 */
	$lang_codes = apply_filters( 'lang_codes', $lang_codes, $code );
	return strtr( $code, $lang_codes );
}

/**
 * Synchronizes category and post tag slugs when global terms are enabled.
 *
 * @since 3.0.0
 *
 * @param WP_Term|array $term     The term.
 * @param string        $taxonomy The taxonomy for `$term`. Should be 'category' or 'post_tag', as these are
 *                                the only taxonomies which are processed by this function; anything else
 *                                will be returned untouched.
 * @return WP_Term|array Returns `$term`, after filtering the 'slug' field with `sanitize_title()`
 *                       if `$taxonomy` is 'category' or 'post_tag'.
 */
function sync_category_tag_slugs( $term, $taxonomy ) {
	if ( global_terms_enabled() && ( 'category' === $taxonomy || 'post_tag' === $taxonomy ) ) {
		if ( is_object( $term ) ) {
			$term->slug = sanitize_title( $term->name );
		} else {
			$term['slug'] = sanitize_title( $term['name'] );
		}
	}
	return $term;
}

/**
 * Displays an access denied message when a user tries to view a site's dashboard they
 * do not have access to.
 *
 * @since 3.2.0
 * @access private
 */
function _access_denied_splash() {
	if ( ! is_user_logged_in() || is_network_admin() ) {
		return;
	}

	$blogs = get_blogs_of_user( get_current_user_id() );

	if ( wp_list_filter( $blogs, array( 'userblog_id' => get_current_blog_id() ) ) ) {
		return;
	}

	$blog_name = get_bloginfo( 'name' );

	if ( empty( $blogs ) ) {
		wp_die(
			sprintf(
				/* translators: 1: Site title. */
				__( 'You attempted to access the "%1$s" dashboard, but you do not currently have privileges on this site. If you believe you should be able to access the "%1$s" dashboard, please contact your network administrator.' ),
				$blog_name
			),
			403
		);
	}

	$output = '
' . sprintf(
		/* translators: 1: Site title. */
		__( 'You attempted to access the "%1$s" dashboard, but you do not currently have privileges on this site. If you believe you should be able to access the "%1$s" dashboard, please contact your network administrator.' ),
		$blog_name
	) . '
';
	$output .= '
' . __( 'If you reached this screen by accident and meant to visit one of your own sites, here are some shortcuts to help you find your way.' ) . '
';

	$output .= '
' . __( 'Your Sites' ) . '
';
	$output .= '
';

	foreach ( $blogs as $blog ) {
		$output .= '
';
		$output .= "{$blog->blogname}	";
		$output .= 'userblog_id ) ) . '">' . __( 'Visit Dashboard' ) . ' | ' .
			'userblog_id ) ) . '">' . __( 'View Site' ) . '	';
		$output .= '
';
	}

	$output .= '
';

	wp_die( $output, 403 );
}

/**
 * Checks if the current user has permissions to import new users.
 *
 * @since 3.0.0
 *
 * @param string $permission A permission to be checked. Currently not used.
 * @return bool True if the user has proper permissions, false if they do not.
 */
function check_import_new_users( $permission ) {
	if ( ! current_user_can( 'manage_network_users' ) ) {
		return false;
	}

	return true;
}
// See "import_allow_fetch_attachments" and "import_attachment_size_limit" filters too.

/**
 * Generates and displays a drop-down of available languages.
 *
 * @since 3.0.0
 *
 * @param string[] $lang_files Optional. An array of the language files. Default empty array.
 * @param string   $current    Optional. The current language code. Default empty.
 */
function mu_dropdown_languages( $lang_files = array(), $current = '' ) {
	$flag   = false;
	$output = array();

	foreach ( (array) $lang_files as $val ) {
		$code_lang = basename( $val, '.mo' );

		if ( 'en_US' === $code_lang ) { // American English.
			$flag          = true;
			$ae            = __( 'American English' );
			$output[ $ae ] = '<option value="' . esc_attr( $code_lang ) . '"' . selected( $current, $code_lang, false ) . '> ' . $ae . '</option>';
		} elseif ( 'en_GB' === $code_lang ) { // British English.
			$flag          = true;
			$be            = __( 'British English' );
			$output[ $be ] = '<option value="' . esc_attr( $code_lang ) . '"' . selected( $current, $code_lang, false ) . '> ' . $be . '</option>';
		} else {
			$translated            = format_code_lang( $code_lang );
			$output[ $translated ] = '<option value="' . esc_attr( $code_lang ) . '"' . selected( $current, $code_lang, false ) . '> ' . esc_html( $translated ) . '</option>';
		}
	}

	if ( false === $flag ) { // WordPress English.
		$output[] = '<option value=""' . selected( $current, '', false ) . '>' . __( 'English' ) . '</option>';
	}

	// Order by name.
	uksort( $output, 'strnatcasecmp' );

	/**
	 * Filters the languages available in the dropdown.
	 *
	 * @since MU (3.0.0)
	 *
	 * @param string[] $output     Array of HTML output for the dropdown.
	 * @param string[] $lang_files Array of available language files.
	 * @param string   $current    The current language code.
	 */
	$output = apply_filters( 'mu_dropdown_languages', $output, $lang_files, $current );

	echo implode( "\n\t", $output );
}

/**
 * Displays an admin notice to upgrade all sites after a core upgrade.
 *
 * @since 3.0.0
 *
 * @global int    $wp_db_version WordPress database version.
 * @global string $pagenow
 *
 * @return false False if the current user is not a super admin.
 */
function site_admin_notice() {
	global $wp_db_version, $pagenow;

	if ( ! current_user_can( 'upgrade_network' ) ) {
		return false;
	}

	if ( 'upgrade.php' === $pagenow ) {
		return;
	}

	if ( get_site_option( 'wpmu_upgrade_site' ) != $wp_db_version ) {
		echo "
" . sprintf(
			/* translators: %s: URL to Upgrade Network screen. */
			__( 'Thank you for Updating! Please visit the Upgrade Network page to update all your sites.' ),
			esc_url( network_admin_url( 'upgrade.php' ) )
		) . '
';
	}
}

/**
 * Avoids a collision between a site slug and a permalink slug.
 *
 * In a subdirectory installation this will make sure that a site and a post do not use the
 * same subdirectory by checking for a site with the same name as a new post.
 *
 * @since 3.0.0
 *
 * @param array $data    An array of post data.
 * @param array $postarr An array of posts. Not currently used.
 * @return array The new array of post data after checking for collisions.
 */
function avoid_blog_page_permalink_collision( $data, $postarr ) {
	if ( is_subdomain_install() ) {
		return $data;
	}
	if ( 'page' !== $data['post_type'] ) {
		return $data;
	}
	if ( ! isset( $data['post_name'] ) || '' === $data['post_name'] ) {
		return $data;
	}
	if ( ! is_main_site() ) {
		return $data;
	}

	$post_name = $data['post_name'];
	$c         = 0;
	while ( $c < 10 && get_id_from_blogname( $post_name ) ) {
		$post_name .= mt_rand( 1, 10 );
		$c ++;
	}
	if ( $post_name != $data['post_name'] ) {
		$data['post_name'] = $post_name;
	}
	return $data;
}

/**
 * Handles the display of choosing a user's primary site.
 *
 * This displays the user's primary site and allows the user to choose
 * which site is primary.
 *
 * @since 3.0.0
 */
function choose_primary_blog() {
	?>

	<?php /* translators: My Sites label. */ ?>
		<?php _e( 'Primary Site' ); ?>

		<?php
		$all_blogs    = get_blogs_of_user( get_current_user_id() );
		$primary_blog = get_user_meta( get_current_user_id(), 'primary_blog', true );
		if ( count( $all_blogs ) > 1 ) {
			$found = false;
			?>
			<select name="primary_blog" id="primary_blog">
				<?php
				foreach ( (array) $all_blogs as $blog ) {
					if ( $primary_blog == $blog->userblog_id ) {
						$found = true;
					}
					?>
					<option value="<?php echo $blog->userblog_id; ?>"<?php selected( $primary_blog, $blog->userblog_id ); ?>><?php echo esc_url( get_home_url( $blog->userblog_id ) ); ?></option>
					<?php
				}
				?>
			</select>
			<?php
			if ( ! $found ) {
				$blog = reset( $all_blogs );
				update_user_meta( get_current_user_id(), 'primary_blog', $blog->userblog_id );
			}
		} elseif ( count( $all_blogs ) == 1 ) {
			$blog = reset( $all_blogs );
			echo esc_url( get_home_url( $blog->userblog_id ) );
			if ( $primary_blog != $blog->userblog_id ) { // Set the primary blog again if it's out of sync with blog list.
				update_user_meta( get_current_user_id(), 'primary_blog', $blog->userblog_id );
			}
		} else {
			echo 'N/A';
		}
		?>

	<?php
}

/**
 * Whether or not we can edit this network from this page.
 *
 * By default editing of network is restricted to the Network Admin for that `$network_id`.
 * This function allows for this to be overridden.
 *
 * @since 3.1.0
 *
 * @param int $network_id The network ID to check.
 * @return bool True if network can be edited, otherwise false.
 */
function can_edit_network( $network_id ) {
	if ( get_current_network_id() == $network_id ) {
		$result = true;
	} else {
		$result = false;
	}

	/**
	 * Filters whether this network can be edited from this page.
	 *
	 * @since 3.1.0
	 *
	 * @param bool $result     Whether the network can be edited from this page.
	 * @param int  $network_id The network ID to check.
	 */
	return apply_filters( 'can_edit_network', $result, $network_id );
}

/**
 * Thickbox image paths for Network Admin.
 *
 * @since 3.1.0
 *
 * @access private
 */
function _thickbox_path_admin_subfolder() {
	?>

	<?php
}

/**
 * @param array $users
 */
function confirm_delete_users( $users ) {
	$current_user = wp_get_current_user();
	if ( ! is_array( $users ) || empty( $users ) ) {
		return false;
	}
	?>

<?php esc_html_e( 'Users' ); ?>

	<?php if ( 1 === count( $users ) ) : ?>

<?php _e( 'You have chosen to delete the user from all networks and sites.' ); ?>

	<?php else : ?>

<?php _e( 'You have chosen to delete the following users from all networks and sites.' ); ?>

	<?php endif; ?>

	<form action="users.php?action=dodelete" method="post">
	<input type="hidden" name="dodelete" />
	<?php
	wp_nonce_field( 'ms-users-delete' );
	$site_admins = get_super_admins();
	$admin_out   = '<option value="' . esc_attr( $current_user->ID ) . '">' . $current_user->user_login . '</option>';
	?>

	<?php
	$allusers = (array) $_POST['allusers'];
	foreach ( $allusers as $user_id ) {
		if ( '' !== $user_id && '0' != $user_id ) {
			$delete_user = get_userdata( $user_id );

			if ( ! current_user_can( 'delete_user', $delete_user->ID ) ) {
				wp_die(
					sprintf(
						/* translators: %s: User login. */
						__( 'Warning! User %s cannot be deleted.' ),
						$delete_user->user_login
					)
				);
			}

			if ( in_array( $delete_user->user_login, $site_admins, true ) ) {
				wp_die(
					sprintf(
						/* translators: %s: User login. */
						__( 'Warning! User cannot be deleted. The user %s is a network administrator.' ),
						'' . $delete_user->user_login . ''
					)
				);
			}
			?>

				<?php echo $delete_user->user_login; ?>
					<?php echo '<input type="hidden" name="user[]" value="' . esc_attr( $user_id ) . '" />' . "\n"; ?>

			<?php
			$blogs = get_blogs_of_user( $user_id, true );

			if ( ! empty( $blogs ) ) {
				?>
				<fieldset>
<legend>
				<?php
				printf(
					/* translators: %s: User login. */
					__( 'What should be done with content owned by %s?' ),
					'' . $delete_user->user_login . ''
				);
				?>
				</legend>

				<?php
				foreach ( (array) $blogs as $key => $details ) {
					$blog_users = get_users(
						array(
							'blog_id' => $details->userblog_id,
							'fields'  => array( 'ID', 'user_login' ),
						)
					);

					if ( is_array( $blog_users ) && ! empty( $blog_users ) ) {
						$user_site      = "userblog_id ) ) . "'>{$details->blogname}";
						$user_dropdown  = '' . __( 'Select a user' ) . '';
						$user_dropdown .= "<select name='blog[$user_id][$key]' id='reassign_user'>";
						$user_list      = '';

						foreach ( $blog_users as $user ) {
							if ( ! in_array( (int) $user->ID, $allusers, true ) ) {
								$user_list .= "<option value='{$user->ID}'>{$user->user_login}</option>";
							}
						}

						if ( '' === $user_list ) {
							$user_list = $admin_out;
						}

						$user_dropdown .= $user_list;
						$user_dropdown .= "</select>\n";
						?>

								<?php
								/* translators: %s: Link to user's site. */
								printf( __( 'Site: %s' ), $user_site );
								?>

<input type="radio" id="delete_option0" name="delete[<?php echo $details->userblog_id . '][' . $delete_user->ID; ?>]" value="delete" checked="checked" />
							<?php _e( 'Delete all content.' ); ?>

<input type="radio" id="delete_option1" name="delete[<?php echo $details->userblog_id . '][' . $delete_user->ID; ?>]" value="reassign" />
							<?php _e( 'Attribute all content to:' ); ?>
							<?php echo $user_dropdown; ?>

						<?php
					}
				}
				echo '</fieldset>
';
			} else {
				?>

<?php _e( 'User has no sites or content and will be deleted.' ); ?>

			<?php } ?>

			<?php
		}
	}

	?>

	<?php
	/** This action is documented in wp-admin/users.php */
	do_action( 'delete_user_form', $current_user, $allusers );

	if ( 1 === count( $users ) ) :
		?>

<?php _e( 'Once you hit “Confirm Deletion”, the user will be permanently removed.' ); ?>

	<?php else : ?>

<?php _e( 'Once you hit “Confirm Deletion”, these users will be permanently removed.' ); ?>

		<?php
	endif;

	submit_button( __( 'Confirm Deletion' ), 'primary' );
	?>
	</form>
	<?php
	return true;
}

/**
 * Print JavaScript in the header on the Network Settings screen.
 *
 * @since 4.1.0
 */
function network_settings_add_js() {
	?>

	<?php
}

/**
 * Outputs the HTML for a network's "Edit Site" tabular interface.
 *
 * @since 4.6.0
 *
 * @param array $args {
 *     Optional. Array or string of Query parameters. Default empty array.
 *
 *     @type int    $blog_id  The site ID. Default is the current site.
 *     @type array  $links    The tabs to include with (label|url|cap) keys.
 *     @type string $selected The ID of the selected link.
 * }
 */
function network_edit_site_nav( $args = array() ) {

	/**
	 * Filters the links that appear on site-editing network pages.
	 *
	 * Default links: 'site-info', 'site-users', 'site-themes', and 'site-settings'.
	 *
	 * @since 4.6.0
	 *
	 * @param array $links {
	 *     An array of link data representing individual network admin pages.
	 *
	 *     @type array $link_slug {
	 *         An array of information about the individual link to a page.
	 *
	 *         $type string $label Label to use for the link.
	 *         $type string $url   URL, relative to `network_admin_url()` to use for the link.
	 *         $type string $cap   Capability required to see the link.
	 *     }
	 * }
	 */
	$links = apply_filters(
		'network_edit_site_nav_links',
		array(
			'site-info'     => array(
				'label' => __( 'Info' ),
				'url'   => 'site-info.php',
				'cap'   => 'manage_sites',
			),
			'site-users'    => array(
				'label' => __( 'Users' ),
				'url'   => 'site-users.php',
				'cap'   => 'manage_sites',
			),
			'site-themes'   => array(
				'label' => __( 'Themes' ),
				'url'   => 'site-themes.php',
				'cap'   => 'manage_sites',
			),
			'site-settings' => array(
				'label' => __( 'Settings' ),
				'url'   => 'site-settings.php',
				'cap'   => 'manage_sites',
			),
		)
	);

	// Parse arguments.
	$parsed_args = wp_parse_args(
		$args,
		array(
			'blog_id'  => isset( $_GET['blog_id'] ) ? (int) $_GET['blog_id'] : 0,
			'links'    => $links,
			'selected' => 'site-info',
		)
	);

	// Setup the links array.
	$screen_links = array();

	// Loop through tabs.
	foreach ( $parsed_args['links'] as $link_id => $link ) {

		// Skip link if user can't access.
		if ( ! current_user_can( $link['cap'], $parsed_args['blog_id'] ) ) {
			continue;
		}

		// Link classes.
		$classes = array( 'nav-tab' );

		// Aria-current attribute.
		$aria_current = '';

		// Selected is set by the parent OR assumed by the $pagenow global.
		if ( $parsed_args['selected'] === $link_id || $link['url'] === $GLOBALS['pagenow'] ) {
			$classes[]    = 'nav-tab-active';
			$aria_current = ' aria-current="page"';
		}

		// Escape each class.
		$esc_classes = implode( ' ', $classes );

		// Get the URL for this link.
		$url = add_query_arg( array( 'id' => $parsed_args['blog_id'] ), network_admin_url( $link['url'] ) );

		// Add link to nav links.
		$screen_links[ $link_id ] = '' . esc_html( $link['label'] ) . '';
	}

	// All done!
	echo '';
	echo implode( '', $screen_links );
	echo '';
}

/**
 * Returns the arguments for the help tab on the Edit Site screens.
 *
 * @since 4.9.0
 *
 * @return array Help tab arguments.
 */
function get_site_screen_help_tab_args() {
	return array(
		'id'      => 'overview',
		'title'   => __( 'Overview' ),
		'content' =>
			'
' . __( 'The menu is for editing information specific to individual sites, particularly if the admin area of a site is unavailable.' ) . '
' .
			'
' . __( 'Info — The site URL is rarely edited as this can cause the site to not work properly. The Registered date and Last Updated date are displayed. Network admins can mark a site as archived, spam, deleted and mature, to remove from public listings or disable.' ) . '
' .
			'
' . __( 'Users — This displays the users associated with this site. You can also change their role, reset their password, or remove them from the site. Removing the user from the site does not remove the user from the network.' ) . '
' .
			'
' . sprintf(
				/* translators: %s: URL to Network Themes screen. */
				__( 'Themes — This area shows themes that are not already enabled across the network. Enabling a theme in this menu makes it accessible to this site. It does not activate the theme, but allows it to show in the site’s Appearance menu. To enable a theme for the entire network, see the Network Themes screen.' ),
				network_admin_url( 'themes.php' )
			) . '
' .
			'
' . __( 'Settings — This page shows a list of all settings associated with this site. Some are created by WordPress and others are created by plugins you activate. Note that some fields are grayed out and say Serialized Data. You cannot modify these values due to the way the setting is stored in the database.' ) . '
',
	);
}

/**
 * Returns the content for the help sidebar on the Edit Site screens.
 *
 * @since 4.9.0
 *
 * @return string Help sidebar content.
 */
function get_site_screen_help_sidebar_content() {
	return '
' . __( 'For more information:' ) . '
' .
		'
' . __( 'Documentation on Site Management' ) . '
' .
		'
' . __( 'Support Forums' ) . '
';
}