3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr1 = ["apple" => "bla", "peer" => "bleh"]; $arr2 = ["apple" => "foo", "bar" => "baz"]; $totalKeys = array_merge(array_keys($arr1), array_keys($arr2)); var_dump($totalKeys);
based on pRW2B
Output for 5.4.0 - 7.1.7
array(4) { [0]=> string(5) "apple" [1]=> string(4) "peer" [2]=> string(5) "apple" [3]=> string(3) "bar" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/fTqYB on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/fTqYB on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/fTqYB on line 3
Process exited with code 255.