3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function &bar() { $bar = null; return $bar; } // vs function &bar2() { return null; } var_dump(bar(1)); var_dump(bar2(1));
based on BDROU
Output for 4.4.0 - 4.4.9, 5.1.0 - 7.2.0
NULL Notice: Only variable references should be returned by reference in /in/EOupL on line 12 NULL
Output for 5.0.0 - 5.0.5
NULL Strict Standards: Only variable references should be returned by reference in /in/EOupL on line 12 NULL
Output for 4.3.0 - 4.3.11
NULL NULL