<?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);
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