3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = 0; $a = array($x); $b = &$a; $x = 2; //unset($x); //$b[1]++; $b[0]++; echo $a[0], ' ', $b[0];
based on qcBob
Output for 4.3.0 - 7.1.0
1 1