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<?php $array = [1, 63, 1, 12, 64, 12]; $new = []; foreach ($array as $value) { if (count(array_keys($array, $value)) == 1) { $new[] = $value; } } var_dump($new);
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.30, 7.4.0 - 7.4.23, 8.0.0 - 8.0.10, 8.1rc1 - rc2
array(2) { [0]=> int(63) [1]=> int(64) }

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61.72 ms | 459 KiB | 5 Q