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<?php $data = [['WIII','WARJ'], ['WIII','WARJ'], ['WARJ','WIII']]; array_walk($data, 'sort'); $data = array_unique($data, SORT_REGULAR); var_dump($data);
Output for 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> array(2) { [0]=> string(4) "WARJ" [1]=> string(4) "WIII" } [1]=> array(2) { [0]=> string(4) "WIII" [1]=> string(4) "WARJ" } }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
array(1) { [0]=> array(2) { [0]=> string(4) "WARJ" [1]=> string(4) "WIII" } }

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156.89 ms | 402 KiB | 198 Q