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@ 2018-04-16T12:32:06Z

<?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
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_keys: documentation ( source)

preferences:dark modelive preview

53.57 ms | 402 KiB | 5 Q