3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f(&$a) {} function &g($a) { $v = $a; return $v; } $a = function() {}; echo "a"; f(array(&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/vdcFi on line 10
Process exited with code 255.
preferences:
189.33 ms | 1395 KiB | 55 Q