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' ) ); $upgradeKeys = $_upgradeKeys; $upgradeKeys[] = 'power-pack'; print_r($upgradeKeys);
based on 2m86t
Output for 4.3.0 - 5.4.32, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => power-pack )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34 - 5.6.28
Array ( [4] => power-pack )