3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function foo(&$bar) { echo "callable is "; var_dump(is_callable($output)); var_dump($bar); } foo($bar);
based on AIXBK
Output for 5.0.4 - 7.2.0
callable is Notice: Undefined variable: output in /in/igLvF on line 7 bool(false) NULL
Output for 4.3.0 - 5.0.3
callable is Notice: Undefined variable: output in /in/igLvF on line 7 bool(false) NULL