3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a =& $x->foo; $a = 1; var_dump($x);
Output for 5.0.0 - 7.1.0
object(stdClass)#1 (1) { ["foo"]=> &int(1) }
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { ["foo"]=> &int(1) }