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<?php $one = [3 => 'en.yml']; $two = [3 => 'de.yml']; var_dump(array_merge($one, $two)); var_dump(array_merge($two, $one)); var_dump(array_intersect($one, $two));
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(2) { [0]=> string(6) "en.yml" [1]=> string(6) "de.yml" } array(2) { [0]=> string(6) "de.yml" [1]=> string(6) "en.yml" } array(0) { }

preferences:
179.33 ms | 404 KiB | 239 Q