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I have a form class and I want define different functions when form be submitted.

<?php

class Forms {

    function __construct() {
        if (!empty($_POST['exampleInput'])) {
            $this->PostedForms();
        }
    }

    function __call($func, $param) {

    }

    function PostedForms() {
        if (!empty($_POST['exampleInput'])) {
            if (function_exists($this->userDefined)) {
                $this->userDefined();
            }
        }
    }

}

$form = new Forms();
$form->userDefined = function ($param) {
    print_r($_POST);
}
?>

I want define userDefined function outside of class. How can I do this? Can I change any function of class after class was called? Can I change userDefined = function ($param) {print_r($_GET);} for example?

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