wp-admin/includes/class-wp-automatic-updater.php:642Kicks off the background update process, looping through all pending updates.
2 hooks fire while WP_Automatic_Updater::run() runs, in this order:
Filters whether to send a debugging email for each automatic background update.
Fires after all automatic updates have run.
public function run() { if ( $this->is_disabled() ) { return; } if ( ! is_main_network() || ! is_main_site() ) { return; } if ( ! WP_Upgrader::create_lock( 'auto_updater' ) ) { return; } $is_debug = WP_DEBUG && WP_DEBUG_LOG; if ( $is_debug ) { error_log( 'Automatic updates starting...' ); } // Don't automatically run these things, as we'll handle it ourselves. remove_action( 'upgrader_process_complete', array( 'Language_Pack_Upgrader', 'async_upgrade' ), 20 ); remove_action( 'upgrader_process_complete', 'wp_version_check' ); remove_action( 'upgrader_process_complete', 'wp_update_plugins' ); remove_action( 'upgrader_process_complete', 'wp_update_themes' ); // Next, plugins. wp_update_plugins(); // Check for plugin updates. $plugin_updates = get_site_transient( 'update_plugins' ); if ( $plugin_updates && ! empty( $plugin_updates->response ) ) { if ( $is_debug ) { error_log( ' Automatic plugin updates starting...' ); } foreach ( $plugin_updates->response as $plugin ) { $this->update( 'plugin', $plugin ); } // Force refresh of plugin update information. wp_clean_plugins_cache(); if ( $is_debug ) { error_log( ' Automatic plugin updates complete.' ); } } // Next, those themes we all love. wp_update_themes(); // Check for theme updates. $theme_updates = get_site_transient( 'update_themes' ); if ( $theme_updates && ! empty( $theme_updates->response ) ) { if ( $is_debug ) { error_log( ' Automatic theme updates starting...' ); } foreach ( $theme_updates->response as $theme ) { $this->update( 'theme', (object) $theme ); } // Force refresh of theme update information. wp_clean_themes_cache(); if ( $is_debug ) { error_log( ' Automatic theme updates complete.' ); } } if ( $is_debug ) { error_log( 'Automatic updates complete.' ); } // Next, process any core update. wp_version_check(); // Check for core updates. $core_update = find_core_auto_update(); if ( $core_update ) { $this->update( 'core', $core_update ); } /* * Clean up, and check for any pending translations. * (Core_Upgrader checks for core updates.) */Introduced in 3.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-automatic-updater.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.