3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function &g(&$v) { return $v; } $foo = null; $name = 'foo'; var_dump(array(&g($$name)));
Output for hhvm-3.10.0 - 3.12.0
array(1) { [0]=> &NULL }
Output for 5.3.0 - 5.4.26
Fatal error: Can't use function return value in write context in /in/AWH2k on line 8
Process exited with code 255.