isset

you might not need a substitute since you can use isset. For example

I have a form with a submit button input as follows :

Code:

<input type="submit" name="submit" class="btn btn-info"value="submit" />
//the key thing here is the name of the button which is submit

in the controller that processes what was submitted from the form, i could check to see if the button was clicked with submit.

As follows :

Code:

echo isset($_POST['submit']);

i'm playing with forms at the moment and checked this still works , output was "1".