3v4l.org

run code in 300+ PHP versions simultaneously
<?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; $upgradeKeys[] = 'power-pack'; print_r($upgradeKeys);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.32, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [0] => power-pack )
Output for 5.4.34 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Array ( [4] => power-pack )

preferences:
231.14 ms | 402 KiB | 325 Q