/**
* Main g_tool_tips Instance
*
* Ensures only one instance of g_tool_tips is loaded or can be loaded.
*
* @since 1.0.0
* @static
* @see g_tool_tips()
* @return Main g_tool_tips instance
*/
public static function instance($file = '', $version = '1.0.0')
{
if (is_null(self::$_instance)) {
self::$_instance = new self($file, $version);
}
return self::$_instance;
}