检查并返回重复数组php [英] Check and return duplicates array php

问题描述

我想检查我的数组是否有任何重复项并返回数组中的重复值.我希望这尽可能高效.

I would like to check if my array has any duplicates and return the duplicated values in an array. I want this to be as efficient as possible.

示例:

$array = array( 1, 2, 2, 4, 5 );
function return_dup($array); // should return 2

$array2 = array( 1, 2, 1, 2, 5 );
function return_dup($array2); // should return an array with 1,2

同样，初始数组总是有 5 个位置

Also the initial array is always 5 positions long

推荐答案

这将比 array_diff 快约 100 倍

this will be ~100 times faster than array_diff

$dups = array();
foreach(array_count_values($arr) as $val => $c)
    if($c > 1) $dups[] = $val;

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