3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo Serialize(Array(action=>"Hello"));
based on GZYWU
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant action - assumed 'action' in /in/IvR4W on line 3 a:1:{s:6:"action";s:5:"Hello";}