3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo strftime('%G%V', strtotime("last day of 2011-12"));
Output for 5.3.0 - 7.2.0
201152
Output for 4.3.6 - 5.2.17
197001
Output for 4.3.0 - 4.3.5