3v4l.org

run code in 300+ PHP versions simultaneously

sponsor
bughunt
search
recent
about

@ 2025-09-22T01:42:33Z

<?php

declare(strict_types=1);

function foo(int $x, ?int &$y = null) {
    $y = $x ** 2;
    return $x * 2;
}

$a = 100;

var_dump([foo(5, $a), $a]);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

30.54 ms | 404 KiB | 5 Q