3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $ar = []; $ar['a'] = &$ar['b']; $ar['b'] = 1; var_dump($ar);
based on FENrV
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.1.0 - 7.2.6
array(2) { ["b"]=> &int(1) ["a"]=> &int(1) }
Output for 7.0.0 - 7.0.20
array(2) { ["a"]=> &int(1) ["b"]=> &int(1) }