3v4l.org

run code in 300+ PHP versions simultaneously
<?php function &g(&$v) { return $v; } function f(&$v) { $v = 5; } $foo = null; $name = 'foo'; //call_user_func_array('f', array($a = &g($$name))); $a = g($$name); $a = 3; //var_dump(array(g($$name))); var_dump($foo);

preferences:
29.06 ms | 402 KiB | 5 Q