/**
* Main Automatic_DNS_Prefetch Instance
*
* Ensures only one instance of Automatic_DNS_Prefetch is loaded or can be loaded.
*
* @since 1.0.0
* @static
* @see Automatic_DNS_Prefetch()
* @return Main Automatic_DNS_Prefetch instance
*/
public static function instance($file = '', $version = '1.0.0')
{
if (is_null(self::$_instance)) {
self::$_instance = new self($file, $version);
}
return self::$_instance;
}
/**
* Returns the main instance of Automatic_DNS_Prefetch to prevent the need to use globals.
*
* @since 1.0.0
* @return object Automatic_DNS_Prefetch
*/
function Automatic_DNS_Prefetch()
{
$instance = Automatic_DNS_Prefetch::instance(__FILE__, '1.0.0');
return $instance;
}