recated_file() ](https://developer.wordpress.org/reference/functions/_deprecated_file/) ` wp-includes/functions.php ` |  Marks a file as deprecated and inform when it has been used.   
[ _deprecated_argument() ](https://developer.wordpress.org/reference/functions/_deprecated_argument/) ` wp-includes/functions.php ` |  Marks a function argument as deprecated and inform when it has been used.   
[ _doing_it_wrong() ](https://developer.wordpress.org/reference/functions/_doing_it_wrong/) ` wp-includes/functions.php ` |  Marks something as being incorrectly called.   
[ iis7_supports_permalinks() ](https://developer.wordpress.org/reference/functions/iis7_supports_permalinks/) ` wp-includes/functions.php ` |  Checks if IIS 7+ supports pretty permalinks.   
[ smilies_init() ](https://developer.wordpress.org/reference/functions/smilies_init/) ` wp-includes/functions.php ` |  Converts smiley code to the icon graphic file equivalent.   
[ wp_maybe_load_widgets() ](https://developer.wordpress.org/reference/functions/wp_maybe_load_widgets/) ` wp-includes/functions.php ` |  Determines if Widgets library should be loaded.   
[ wp_check_filetype_and_ext() ](https://developer.wordpress.org/reference/functions/wp_check_filetype_and_ext/) ` wp-includes/functions.php ` |  Attempts to determine the real file type of a file.   
[ wp_get_mime_types() ](https://developer.wordpress.org/reference/functions/wp_get_mime_types/) ` wp-includes/functions.php ` |  Retrieves the list of mime types and file extensions.   
[ wp_upload_bits() ](https://developer.wordpress.org/reference/functions/wp_upload_bits/) ` wp-includes/functions.php ` |  Creates a file in the upload folder with given content.   
[ get_allowed_mime_types() ](https://developer.wordpress.org/reference/functions/get_allowed_mime_types/) ` wp-includes/functions.php ` |  Retrieves the list of allowed mime types and file extensions.   
[ wp_die() ](https://developer.wordpress.org/reference/functions/wp_die/) ` wp-includes/functions.php ` |  Kills WordPress execution and displays HTML page with an error message.   
[ do_robots() ](https://developer.wordpress.org/reference/functions/do_robots/) ` wp-includes/functions.php ` |  Displays the default robots.txt file content.   
[ wp_unique_filename() ](https://developer.wordpress.org/reference/functions/wp_unique_filename/) ` wp-includes/functions.php ` |  Gets a filename that is sanitized and unique for the given directory.   
[ wp_upload_dir() ](https://developer.wordpress.org/reference/functions/wp_upload_dir/) ` wp-includes/functions.php ` |  Returns an array containing the current upload directory’s path and URL.   
[ status_header() ](https://developer.wordpress.org/reference/functions/status_header/) ` wp-includes/functions.php ` |  Sets HTTP status header.   
[ wp_get_nocache_headers() ](https://developer.wordpress.org/reference/functions/wp_get_nocache_headers/) ` wp-includes/functions.php ` |  Gets the HTTP header information to prevent caching.   
[ date_i18n() ](https://developer.wordpress.org/reference/functions/date_i18n/) ` wp-includes/functions.php ` |  Retrieves the date in localized format, based on a sum of Unix timestamp and timezone offset in seconds.   
[ number_format_i18n() ](https://developer.wordpress.org/reference/functions/number_format_i18n/) ` wp-includes/functions.php ` |  Converts float number to format based on the locale.   
[ do_enclose() ](https://developer.wordpress.org/reference/functions/do_enclose/) ` wp-includes/functions.php ` |  Checks content for video and audio links to add as enclosures.   
[ WP_Nav_Menu_Widget::widget() ](https://developer.wordpress.org/reference/classes/wp_nav_menu_widget/widget/) ` wp-includes/widgets/class-wp-nav-menu-widget.php ` |  Outputs the content for the current Navigation Menu widget instance.   
[ WP_Widget_Tag_Cloud::widget() ](https://developer.wordpress.org/reference/classes/wp_widget_tag_cloud/widget/) ` wp-includes/widgets/class-wp-widget-tag-cloud.php ` |  Outputs the