text: <?php
  /**
   * Used to set up and fix common variables and include
   * the Multisite procedural and class library.
   *
   * Allows for some configuration in wp-config.php (see ms-default-constants.php)
   *
   * @package ClassicPress
   * @subpackage Multisite
   * @since WP-3.0.0
   */
  
  /**
   * Objects representing the current network and current site.
   *
   * These may be populated through a custom `sunrise.php`. If not, then this
   * file will attempt to populate them based on the current request.
   *
   * @global WP_Network $current_site The current network.
   * @global object     $current_blog The current site.
   * @global string     $domain       Deprecated. The domain of the site found on load.
   *                                  Use `get_site()->domain` instead.
   * @global string     $path         Deprecated. The path of the site found on load.
   *                                  Use `get_site()->path` instead.
   * @global int        $site_id      Deprecated. The ID of the network found on load.
   *                                  Use `get_current_network_id()` instead.
   * @global bool       $public       Deprecated. Whether the site found on load is public.
   *                                  Use `get_site()->public` instead.
   *
   * @since WP-3.0.0
   */
  global $current_site, $current_blog, $domain, $path, $site_id, $public;
  
  /** WP_Network class */
  require_once( ABSPATH . WPINC . '/class-wp-network.php' );
  
  /** WP_Site class */
  require_once( ABSPATH . WPINC . '/class-wp-site.php' );
  
  /** Multisite loader */
  require_once( ABSPATH . WPINC . '/ms-load.php' );
  
  /** Default Multisite constants */
  require_once( ABSPATH . WPINC . '/ms-default-constants.php' );
  
  if ( defined( 'SUNRISE' ) ) {
  	include_once( WP_CONTENT_DIR . '/sunrise.php' );
  }
  
  /** Check for and define SUBDOMAIN_INSTALL and the deprecated VHOST constant. */
  ms_subdomain_constants();
  
  // This block will process a request if the current network or current site objects
  // have not been populated in the global scope through something like `sunrise.php`.
  if ( !isset( $current_site ) || !isset( $current_blog ) ) {
  
  	$domain = strtolower( stripslashes( $_SERVER['HTTP_HOST'] ) );
  	if ( substr( $domain, -3 ) == ':80' ) {
  		$domain = substr( $domain, 0, -3 );
  		$_SERVER['HTTP_HOST'] = substr( $_SERVER['HTTP_HOST'], 0, -3 );
  	} elseif ( substr( $domain, -4 ) == ':443' ) {
  		$domain = substr( $domain, 0, -4 );
  		$_SERVER['HTTP_HOST'] = substr( $_SERVER['HTTP_HOST'], 0, -4 );
  	}
  
  	$path = stripslashes( $_SERVER['REQUEST_URI'] );
  	if ( is_admin() ) {
  		$path = preg_replace( '#(.*)/wp-admin/.*#', '$1/', $path );
  	}
  	list( $path ) = explode( '?', $path );
  
  	$bootstrap_result = ms_load_current_site_and_network( $domain, $path, is_subdomain_install() );
  
  	if ( true === $bootstrap_result ) {
  		// `$current_blog` and `$current_site are now populated.
  	} elseif ( false === $bootstrap_result ) {
  		ms_not_installed( $domain, $path );
  	} else {
  		header( 'Location: ' . $bootstrap_result );
  		exit;
  	}
  	unset( $bootstrap_result );
  
  	$blog_id = $current_blog->blog_id;
  	$public  = $current_blog->public;
  
  	if ( empty( $current_blog->site_id ) ) {
  		// This dates to [MU134] and shouldn't be relevant anymore,
  		// but it could be possible for arguments passed to insert_blog() etc.
  		$current_blog->site_id = 1;
  	}
  
  	$site_id = $current_blog->site_id;
  	wp_load_core_site_options( $site_id );
  }
  
  $wpdb->set_prefix( $table_prefix, false ); // $table_prefix can be set in sunrise.php
  $wpdb->set_blog_id( $current_blog->blog_id, $current_blog->site_id );
  $table_prefix = $wpdb->get_blog_prefix();
  $_wp_switched_stack = array();
  $switched = false;
  
  // need to init cache again after blog_id is set
  wp_start_object_cache();
  
  if ( ! $current_site instanceof WP_Network ) {
  	$current_site = new WP_Network( $current_site );
  }
  
  if ( ! $current_blog instanceof WP_Site ) {
  	$current_blog = new WP_Site( $current_blog );
  }
  
  // Define upload directory constants
  ms_upload_constants();
  
  /**
   * Fires after the current site and network have been detected and loaded
   * in multisite's bootstrap.
   *
   * @since WP-4.6.0
   */
  do_action( 'ms_loaded' );
  