3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function &g(&$v) { $b = $v; return $b; } function f(&$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);
Output for 4.3.0 - 7.1.0
NULL