3v4l.org

run code in 300+ PHP versions simultaneously
<?php $all_servers = ['de' => 'de.example.org', 'fr' => 'fr.example.org', 'it' => 'it.example.org', 'no' => 'no.example.org']; $exclude = ['it', 'fr']; $filtered = array_diff_key($all_servers, array_flip($exclude)); var_dump($filtered);

preferences:
31.51 ms | 402 KiB | 5 Q