3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function whipme($a = NULL) { var_dump($a); $a--; $a++; var_dump($a); } whipme(); whipme(0);
Output for 4.3.0 - 7.2.0
NULL int(1) int(0) int(0)