3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $foo = null; $attributes = ['class' => 'control-label']; if ($foo) { $attributes = array_merge($foo, $attributes); } var_dump($attributes);
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["class"]=> string(13) "control-label" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/fWYhu 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/fWYhu on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/fWYhu on line 3
Process exited with code 255.