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# The URL detection interface for the Facebook SDK for PHP
The URL detection interface allows you to overwrite the default URL detection logic by coding to the `Facebook\Url\UrlDetectionInterface`.
## Facebook\Url\UrlDetectionInterface {#overview}
If you're using a web framework that handles routes and URL generation for you, you might want to code a custom URL detection handler to ensure that your URL's are being generated consistently.
For example if you are using Laravel, a custom handler might look like this:
~~~~
use Facebook\Url\UrlDetectionInterface;
class MyLaravelUrlDetectionHandler implements UrlDetectionInterface
{
/**
* @inheritdoc
*/
public function getCurrentUrl()
{
return \Request::url();
}
}
~~~~
To enable your custom URL detection implementation in the SDK, you can set an instance of the handler to the `url_detection_handler` config of the `Facebook\Facebook` super service.
~~~~
$fb = new Facebook\Facebook([
// . . .
'url_detection_handler' => new MyLaravelUrlDetectionHandler(),
// . . .
]);
~~~~
Alternatively, if you're working with the `Facebook\Helpers\FacebookRedirectLoginHelper` directly, you can inject your custom handler via the constructor.
~~~~
use Facebook\Helpers\FacebookRedirectLoginHelper;
$myUrlDetectionHandler = new MyLaravelUrlDetectionHandler();
$helper = new FacebookRedirectLoginHelper($fbApp, null, $myUrlDetectionHandler);
~~~~
## Method Reference {#method-reference}
### getCurrentUrl() {#get-current-url}
~~~~
public string getCurrentUrl()
~~~~
Returns the full and currently active URL.