3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = [1,2,3]; foreach($a as &$num) {} echo json_encode($a),"\n"; foreach($a as $num) { echo json_encode($a),"\n"; } echo implode(',',$a).PHP_EOL; // 1,2,2
based on 4MtGJ
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0alpha1
[1,2,3] [1,2,1] [1,2,2] [1,2,2] 1,2,2