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<?php $terms = ['one', 'two', 'three', 'one', 'four', 'five', 'two', 'six']; // $output = array_unique($terms); $output = array_keys(array_flip($terms)); print_r($output);
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 ( [0] => one [1] => two [2] => three [3] => four [4] => five [5] => six )

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273.55 ms | 404 KiB | 373 Q