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);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { ["de"]=> string(14) "de.example.org" ["no"]=> string(14) "no.example.org" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/4B73O on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/4B73O on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/4B73O on line 3
Process exited with code 255.
preferences:
301.34 ms | 401 KiB | 459 Q