3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $upgradeKeys = array( 'featured-listing', 'basic-pack', 'designer-blog', 'power-pack' ); $_upgradeKeys = array_diff( $upgradeKeys, array( 'featured-listing', 'basic-pack', 'designer-blog', 'power-pack' ) ); // sort($_upgradeKeys); // $upgradeKeys = $_upgradeKeys; $upgradeKeys[] = 'power-pack'; echo $upgradeKeys[0];
based on lAnQj
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
featured-listing