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重複した要素のみを取得する

Last updated at 2013-03-21Posted at 2013-03-21

<?php
$array = ['A', 'A', 'A', 'B', 'B', 'C', 'D'];

function selectDuplicates($array) {
    $duplicate = array_filter(array_count_values($array), function($v) {
        return $v > 1;
    });

    return array_keys($duplicate);
}

selectDuplicates($array); // => ["A", "B"]

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