3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php <?php $accounts = array(); usort($accounts, function($a, $b) { return ($a->first_name == $b->first_name ? strcmp($a->last_name, $b->last_name) : strcmp($a->first_name, $b->first_name)); });
Output for 5.3.0 - 5.5.3
Parse error: syntax error, unexpected '<' in /in/VojeQ on line 2
Process exited with code 255.