3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = ['a' => null,'b' => null,c => null,]; $b = [b=>'x']; var_dump(array_merge($a, $b));
Output for 7.2.0
Warning: Use of undefined constant c - assumed 'c' (this will throw an Error in a future version of PHP) in /in/VTbsD on line 3 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/VTbsD on line 4 array(3) { ["a"]=> NULL ["b"]=> string(1) "x" ["c"]=> NULL }
Output for 5.4.2 - 7.1.10
Notice: Use of undefined constant c - assumed 'c' in /in/VTbsD on line 3 Notice: Use of undefined constant b - assumed 'b' in /in/VTbsD on line 4 array(3) { ["a"]=> NULL ["b"]=> string(1) "x" ["c"]=> NULL }
Output for 5.3.18 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/VTbsD on line 3
Process exited with code 255.