3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function foo(&$x){ $x = null; } $a = 8; foo($a); var_dump($a,is_ref($a));
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: Call to undefined function is_ref() in /in/iIHCH:7 Stack trace: #0 {main} thrown in /in/iIHCH on line 7
Process exited with code 255.
Output for hhvm-3.12.0
Fatal error: Uncaught Error: Call to undefined function is_ref() in /in/iIHCH:7 Stack trace: #0 {main}
Process exited with code 255.
Output for 5.0.0 - 5.6.28, hhvm-3.10.0
Fatal error: Call to undefined function is_ref() in /in/iIHCH on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: is_ref() in /in/iIHCH on line 7
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: is_ref() in /in/iIHCH on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: is_ref() in /in/iIHCH on line 7