wp-admin/includes/class-theme-upgrader.php:383Upgrades several themes at once.
$themesstring[]$argsarrayoptionalarray()$clear_update_cachebooldefault: true
array[]|falseOne hook fires while Theme_Upgrader::bulk_upgrade() runs, in this order:
Fires when the upgrader process is complete.
public function bulk_upgrade( $themes, $args = array() ) { $wp_version = wp_get_wp_version(); $defaults = array( 'clear_update_cache' => true, ); $parsed_args = wp_parse_args( $args, $defaults ); $this->init(); $this->bulk = true; $this->upgrade_strings(); $current = get_site_transient( 'update_themes' ); add_filter( 'upgrader_pre_install', array( $this, 'current_before' ), 10, 2 ); add_filter( 'upgrader_post_install', array( $this, 'current_after' ), 10, 2 ); add_filter( 'upgrader_clear_destination', array( $this, 'delete_old_theme' ), 10, 4 ); $this->skin->header(); // Connect to the filesystem first. $res = $this->fs_connect( array( WP_CONTENT_DIR ) ); if ( ! $res ) { $this->skin->footer(); return false; } $this->skin->bulk_header(); /* * Only start maintenance mode if: * - running Multisite and there are one or more themes specified, OR * - a theme with an update available is currently in use. * @todo For multisite, maintenance mode should only kick in for individual sites if at all possible. */ $maintenance = ( is_multisite() && ! empty( $themes ) ); foreach ( $themes as $theme ) { $maintenance = $maintenance || get_stylesheet() === $theme || get_template() === $theme; } if ( $maintenance ) { $this->maintenance_mode( true ); } $results = array(); $this->update_count = count( $themes ); $this->update_current = 0; foreach ( $themes as $theme ) { ++$this->update_current; $this->skin->theme_info = $this->theme_info( $theme ); if ( ! isset( $current->response[ $theme ] ) ) { $this->skin->set_result( true ); $this->skin->before(); $this->skin->feedback( 'up_to_date' ); $this->skin->after(); $results[ $theme ] = true; continue; } // Get the URL to the zip file. $r = $current->response[ $theme ]; if ( isset( $r['requires'] ) && ! is_wp_version_compatible( $r['requires'] ) ) { $result = new WP_Error( 'incompatible_wp_required_version', sprintf( /* translators: 1: Current WordPress version, 2: WordPress version required by the new theme version. */ __( 'Your WordPress version is %1$s, however the new theme version requires %2$s.' ), $wp_version, $r['requires'] ) ); $this->skin->before( $result ); $this->skin->error( $result ); $this->skin->after(); } elseif ( isset( $r['requires_php'] ) && ! is_php_version_compatible( $r['requires_php'] ) ) { $result = new WP_Error( 'incompatible_php_required_version',Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-theme-upgrader.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.