Optional Parameter¶

Optional parameter are parameter fitted with a default value. They may then be skipped when the function is called.

Optional parameter should be the last parameters : otherwise, PHP will have trouble figuring out which parameter uses which value.

<?php

function foo($a, $b = 2) { }

// $b will be 2, using the default value
foo(1);

// $b will be 3
foo(1, 3);

?>