3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function F(&$r) { $r++; } $r = 1; f(f($r)); echo $r;
Output for 7.0.0 - 7.1.0
Notice: Only variables should be passed by reference in /in/eBj2t on line 7 2
Output for 5.1.0 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/eBj2t on line 7 2
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/eBj2t on line 7
Process exited with code 255.
Output for 4.3.0 - 5.0.4
2