3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $counts = []; $item = 1; $counts[$item] ?? $counts[$item]++ ?? $counts[$item] = 1;
Output for 7.0.0 - 7.2.0
Notice: Undefined offset: 1 in /in/3JeQd on line 7
Output for 5.4.11 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/3JeQd on line 7
Process exited with code 255.
Output for 5.3.21 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/3JeQd on line 3
Process exited with code 255.