Parameter Removal

Parameter removal is the operation to remove a parameter in a method’s signature.

This may happen in two ways:

• Between versions of the code. A method may see one of its parameter being deprecated then removed.

• In a function relay, where the method doesn’t transmit all its incoming parameters to the next.

<?php

// get_defined_functions's only paramter was removed in PHP 8.4
$list = get_defined_functions(false);

class x {
     public function foo($a, $b) {
             // $b is ignored, and set to a fixed value.
             // $b is actually removed for 'public' usage
             $this->goo($a, 2);
     }

     private function goo($a, $b = 1) {
             // do Something
     }
}
?>