p ` |  Retrieves mod_rewrite-formatted rewrite rules to write to .htaccess.   
[ WP_Rewrite::iis7_url_rewrite_rules() ](https://developer.wordpress.org/reference/classes/wp_rewrite/iis7_url_rewrite_rules/) ` wp-includes/class-wp-rewrite.php ` |  Retrieves IIS7 URL Rewrite formatted rewrite rules to write to web.config file.   
[ WP_Rewrite::flush_rules() ](https://developer.wordpress.org/reference/classes/wp_rewrite/flush_rules/) ` wp-includes/class-wp-rewrite.php ` |  Removes rewrite rules and then recreate rewrite rules.   
[ WP_Rewrite::rewrite_rules() ](https://developer.wordpress.org/reference/classes/wp_rewrite/rewrite_rules/) ` wp-includes/class-wp-rewrite.php ` |  Constructs rewrite matches and queries from permalink structure.   
[ url_to_postid() ](https://developer.wordpress.org/reference/functions/url_to_postid/) ` wp-includes/rewrite.php ` |  Examines a URL and try to determine the post ID it represents.   
[ redirect_canonical() ](https://developer.wordpress.org/reference/functions/redirect_canonical/) ` wp-includes/canonical.php ` |  Redirects incoming links to the proper URL based on the site url.   
[ redirect_guess_404_permalink() ](https://developer.wordpress.org/reference/functions/redirect_guess_404_permalink/) ` wp-includes/canonical.php ` |  Attempts to guess the correct URL for a 404 request based on query vars.   
[ wp_revisions_to_keep() ](https://developer.wordpress.org/reference/functions/wp_revisions_to_keep/) ` wp-includes/revision.php ` |  Determines how many revisions to retain for a given post.   
[ _wp_post_revision_fields() ](https://developer.wordpress.org/reference/functions/_wp_post_revision_fields/) ` wp-includes/revision.php ` |  Determines which fields of posts are to be saved in revisions.   
[ wp_save_post_revision() ](https://developer.wordpress.org/reference/functions/wp_save_post_revision/) ` wp-includes/revision.php ` |  Creates a revision for the current version of a post.   
[ get_space_used() ](https://developer.wordpress.org/reference/functions/get_space_used/) ` wp-includes/ms-functions.php ` |  Returns the space used by the current site.   
[ get_space_allowed() ](https://developer.wordpress.org/reference/functions/get_space_allowed/) ` wp-includes/ms-functions.php ` |  Returns the upload quota for the current blog.   
[ wp_is_large_network() ](https://developer.wordpress.org/reference/functions/wp_is_large_network/) ` wp-includes/ms-functions.php ` |  Determines whether or not we have a large network.   
[ wp_maybe_update_network_site_counts() ](https://developer.wordpress.org/reference/functions/wp_maybe_update_network_site_counts/) ` wp-includes/ms-functions.php ` |  Updates the count of sites for the current network.   
[ wp_maybe_update_network_user_counts() ](https://developer.wordpress.org/reference/functions/wp_maybe_update_network_user_counts/) ` wp-includes/ms-functions.php ` |  Updates the network-wide users count.   
[ wpmu_welcome_user_notification() ](https://developer.wordpress.org/reference/functions/wpmu_welcome_user_notification/) ` wp-includes/ms-functions.php ` |  Notifies a user that their account activation has been successful.   
[ maybe_redirect_404() ](https://developer.wordpress.org/reference/functions/maybe_redirect_404/) ` wp-includes/ms-functions.php ` |  Corrects 404 redirects when NOBLOGREDIRECT is defined.   
[ recurse_dirsize() ](https://developer.wordpress.org/reference/functions/recurse_dirsize/) ` wp-includes/functions.php ` |  Gets the size of a directory recursively.   
[ newblog_notify_siteadmin() ](https://developer.wordpress.org/reference/functions/newblog_notify_siteadmin/) ` wp-includes/ms-functions.php ` |  Notifies the network admin that a new site has been activated.   
[ newuser_notify_siteadmin() ](https://developer.wordpress.org/reference/functions/newuser_notify_siteadmin/) ` wp-includes/ms-functions.php ` |  Notifies the network admin that a new user has been activated.   
[ domain_exists() ](https://developer.wordpress.org/