3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = ['a'=>b, 'c'=>d]; echo $arr[0];
Output for 7.2.0
Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/iWEdZ on line 3 Warning: Use of undefined constant d - assumed 'd' (this will throw an Error in a future version of PHP) in /in/iWEdZ on line 3 Notice: Undefined offset: 0 in /in/iWEdZ on line 4
Output for 5.4.10 - 7.1.10
Notice: Use of undefined constant b - assumed 'b' in /in/iWEdZ on line 3 Notice: Use of undefined constant d - assumed 'd' in /in/iWEdZ on line 3 Notice: Undefined offset: 0 in /in/iWEdZ on line 4
Output for 5.3.20 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/iWEdZ on line 3
Process exited with code 255.