3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a=array('title'=>'a','arr'=>[]); $b=array('title'=>'b',arr=>[]);
Output for 7.2.0
Warning: Use of undefined constant arr - assumed 'arr' (this will throw an Error in a future version of PHP) in /in/64HTZ on line 6
Output for 5.4.2 - 7.1.10
Notice: Use of undefined constant arr - assumed 'arr' in /in/64HTZ on line 6
Output for 5.3.18 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/64HTZ on line 2
Process exited with code 255.