3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function f(&$x) {$x = 1;} f(@$x); echo $x;
Output for 7.0.0 - 7.1.0
Notice: Only variables should be passed by reference in /in/PmTnN on line 3 Notice: Undefined variable: x in /in/PmTnN on line 4
Output for 5.1.0 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/PmTnN on line 3 Notice: Undefined variable: x in /in/PmTnN on line 4
Output for 4.3.2 - 4.4.0, 5.0.0 - 5.0.5
Fatal error: Only variables can be passed by reference in /in/PmTnN on line 3
Process exited with code 255.
Output for 4.4.1 - 4.4.9
Notice: Only variables can be passed by reference in /in/PmTnN on line 3 Notice: Undefined variable: x in /in/PmTnN on line 4
Output for 4.3.0 - 4.3.1
Fatal error: Only variables can be passed by reference in /in/PmTnN on line 3