<?php $arr = [1, 2, 3, 4, 4, 1, 2, 5, 5, 11, 11]; sort($arr); for($i = 0, $max = count($arr); $i < $max; $i++){ // is single number last element in array? if($i == count($arr)-1) $singleNum = $arr[$i]; // If adjacent elements the same, skip if($i < count($arr)-1 && $arr[$i] == $arr[$i+1]){ $i++; } else { // found single number. $singleNum = $arr[$i]; } } var_dump($singleNum);
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