3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function &g(&$v) { return $v; } $foo = null; $name = 'this'; var_dump(array(g($$name)));
Output for 7.1.0
Fatal error: Uncaught Error: Cannot re-assign $this in /in/p4qqj:8 Stack trace: #0 {main} thrown in /in/p4qqj on line 8
Process exited with code 255.
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.0.14
array(1) { [0]=> NULL }