3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function wer($x) { echo $x; } $e = 'ert'; call_user_func('wer', &$e);
based on dT7eT
Output for 7.0.0 - 7.1.7
Parse error: syntax error, unexpected '&' in /in/GWWuh on line 6
Process exited with code 255.
Output for hhvm-3.15.4
Fatal error: Uncaught Error: Call-time pass-by-reference has been removed in /in/GWWuh:6 Stack trace: #0 {main}
Process exited with code 255.
Output for 5.6.0 - 5.6.30
Fatal error: Call-time pass-by-reference has been removed in /in/GWWuh on line 6
Process exited with code 255.