3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function f($req, $opt = null) { printf('$req: %d; $opt: %d;'."\n", $req, $opt); } f(1); f(1, 2); f(1, 2, 3); f(1, 2, 3, 4); f(1, 2, 3, 4, 5); ?>
Output for 4.3.0 - 7.1.0
$req: 1; $opt: 0; $req: 1; $opt: 2; $req: 1; $opt: 2; $req: 1; $opt: 2; $req: 1; $opt: 2;