WP_Upgrader::maintenance_mode( bool $enable = false )

Source

public function maintenance_mode( $enable = false ) {
	global $wp_filesystem;
	$file = $wp_filesystem->abspath() . '.maintenance';
	if ( $enable ) {
		$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 ) ) {
		$this->skin->feedback( 'maintenance_end' );
		$wp_filesystem->delete( $file );
	}
}

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