3v4l.org

run code in 200+ php & hhvm versions
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<?php function fuck( $a ){ var_dump($a); } fuck(null); fuck(array('this', 'world')); fuck('world');
based on SuEfo
Output for 4.3.0 - 7.2.0
NULL array(2) { [0]=> string(4) "this" [1]=> string(5) "world" } string(5) "world"