3v4l.org

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<?php $array = [ 0 => "Sat 2", 1 => "Sun 3", 2 => "Mon 4", 3 => "Tue 5", 4 => "Mon 4" ]; $valuesCounterArr = array_count_values($array); print_r($valuesCounterArr); $finalArr = []; foreach($valuesCounterArr as $key=>$val){ if($val == 1){ $finalArr[] = $key; } } print_r($finalArr);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Array ( [Sat 2] => 1 [Sun 3] => 1 [Mon 4] => 2 [Tue 5] => 1 ) Array ( [0] => Sat 2 [1] => Sun 3 [2] => Tue 5 )
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148.16 ms | 402 KiB | 123 Q