WP_Upgrader::maintenance_mode( bool $enable = false )

Source

public function maintenance_mode( $enable = false ) {
	global $wp_filesystem;

	if ( ! $wp_filesystem ) {
		if ( ! function_exists( 'WP_Filesystem' ) ) {
			require_once ABSPATH . 'wp-admin/includes/file.php';
		}

		ob_start();
		$credentials = request_filesystem_credentials( '' );
		ob_end_clean();

		if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {
			wp_trigger_error( __FUNCTION__, __( 'Could not access filesystem.' ) );
			return;
		}
	}

	$file = $wp_filesystem->abspath() . '.maintenance';
	if ( $enable ) {
		if ( ! wp_doing_cron() ) {
			$this->skin->feedback( 'maintenance_start' );
		}
		// Create maintenance file to signal that we are upgrading.
		$maintenance_string = '<?php $upgrading = ' . time() . '; ?>';
		$wp_filesystem->delete( $file );
		$wp_filesystem->put_contents( $file, $maintenance_string, FS_CHMOD_FILE );
	} elseif ( ! $enable && $wp_filesystem->exists( $file ) ) {
		if ( ! wp_doing_cron() ) {
			$this->skin->feedback( 'maintenance_end' );
		}
		$wp_filesystem->delete( $file );
	}
}

View all references View on Trac View on GitHub