3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f(&$a) {} function g($a) { $v = $a; return $v; } $a = function() {}; var_dump(array(&g("a"))); f(g(3));
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.19
Fatal error: Can't use function return value in write context in /in/LirAX on line 8
Process exited with code 255.
preferences:
176.82 ms | 1395 KiB | 55 Q