3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $counts = array(); $item = 2; $counts[$item] = ($counts[$item] ?? 0) + 1; var_dump($counts); $counts[$item] = ($counts[$item] ?? 0) + 1; var_dump($counts);
based on HM4O6
Output for 7.0.0 - 7.2.0
array(1) { [2]=> int(1) } array(1) { [2]=> int(2) }
Output for 5.3.21 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/DMnbW on line 6
Process exited with code 255.