3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $array = [1,2]; foreach($array as &$a) { if ($a == 1) { $array[] = 3; } echo $a . "\n"; } var_dump($array); echo "----------\n"; foreach($array as $a) { var_dump($a); echo $a . "\n"; }
based on HXKqi
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0beta1
1 2 3 array(3) { [0]=> int(1) [1]=> int(2) [2]=> &int(3) } ---------- int(1) 1 int(2) 2 int(2) 2