3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function a($a) { unset($a); for ($i = 0; $i < 255; $i++) { $GLOBALS['v'][$i] = 'hi'.$i; } var_dump(func_get_arg(0)); } a("1st"); ?>
based on R7V8k
Output for 7.0.0 - 7.2.0
NULL
Output for 5.3.18 - 5.6.28
string(3) "1st"