3v4l.org

run code in 300+ PHP versions simultaneously
<?php function a($a) { unset($a); for ($i = 0; $i < 5; $i++) { $v[$i] = 'hi'.$i; } var_dump(func_get_arg(0)); } a("1st"); ?>

preferences:
48.05 ms | 402 KiB | 5 Q