3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f(&$a) {} function g($a) { $v = $a; return $v; } $a = function() {}; array(&$a("a")); f(g(3));
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.19, 5.5.0 - 5.5.3
Fatal error: Can't use function return value in write context in /in/W132q on line 8
Process exited with code 255.
preferences:
181.48 ms | 1395 KiB | 59 Q