WP_Object_Cache::add_global_groups( string|string[] $groups )

Source

File: wp-includes/class-wp-object-cache.php

public function add_global_groups( $groups ) {
		$groups = (array) $groups;

		$groups              = array_fill_keys( $groups, true );
		$this->global_groups = array_merge( $this->global_groups, $groups );
	}