wp-includes/ms-site.php:653Runs the initialization routine for a given site.
$site_idint|WP_Site$argsarrayoptionalarray()$user_idint
$titlestringdefault: is 'Site %d' where %d is the site ID
$optionsarraydefault: empty array
$metaarraydefault: empty array
true|WP_ErrorOne hook fires while wp_initialize_site() runs, in this order:
Filters the arguments for initializing a site.
function wp_initialize_site( $site_id, array $args = array() ) { global $wpdb, $wp_roles; if ( empty( $site_id ) ) { return new WP_Error( 'site_empty_id', __( 'Site ID must not be empty.' ) ); } $site = get_site( $site_id ); if ( ! $site ) { return new WP_Error( 'site_invalid_id', __( 'Site with the ID does not exist.' ) ); } if ( wp_is_site_initialized( $site ) ) { return new WP_Error( 'site_already_initialized', __( 'The site appears to be already initialized.' ) ); } $network = get_network( $site->network_id ); if ( ! $network ) { $network = get_network(); } $args = wp_parse_args( $args, array( 'user_id' => 0, /* translators: %d: Site ID. */ 'title' => sprintf( __( 'Site %d' ), $site->id ), 'options' => array(), 'meta' => array(), ) ); /** * Filters the arguments for initializing a site. * * @since 5.1.0 * * @param array $args Arguments to modify the initialization behavior. * @param WP_Site $site Site that is being initialized. * @param WP_Network $network Network that the site belongs to. */ $args = apply_filters( 'wp_initialize_site_args', $args, $site, $network ); $orig_installing = wp_installing(); if ( ! $orig_installing ) { wp_installing( true ); } $switch = false; if ( get_current_blog_id() !== $site->id ) { $switch = true; switch_to_blog( $site->id ); } require_once ABSPATH . 'wp-admin/includes/upgrade.php'; // Set up the database tables. make_db_current_silent( 'blog' ); $home_scheme = 'http'; $siteurl_scheme = 'http'; if ( ! is_subdomain_install() ) { if ( 'https' === parse_url( get_home_url( $network->site_id ), PHP_URL_SCHEME ) ) { $home_scheme = 'https'; } if ( 'https' === parse_url( get_network_option( $network->id, 'siteurl' ), PHP_URL_SCHEME ) ) { $siteurl_scheme = 'https'; } } // Populate the site's options. populate_options( array_merge( array( 'home' => untrailingslashit( $home_scheme . '://' . $site->domain . $site->path ), 'siteurl' => untrailingslashit( $siteurl_scheme . '://' . $site->domain . $site->path ), 'blogname' => wp_unslash( $args['title'] ), 'admin_email' => '', 'upload_path' => get_network_option( $network->id, 'ms_files_rewriting' ) ? UPLOADBLOGSDIR . "/{$site->id}/files" : get_blog_option( $network->site_id, 'upload_path' ), 'blog_public' => (int) $site->public,Introduced in 5.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ms-site.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.