检查并返回重复数组php

function findDuplicates($arr) {
    $duplicates = array();
    $count = array_count_values($arr);
    
    foreach ($count as $key => $value) {
        if ($value > 1) {
            $duplicates[] = $key;
        }
    }
    
    return $duplicates;
}

$array = array(1, 2, 3, 4, 4, 5, 6, 6, 7);
$duplicates = findDuplicates($array);

if (count($duplicates) > 0) {
    echo "重复的数组元素：";
    foreach ($duplicates as $duplicate) {
        echo $duplicate . " ";
    }
} else {
    echo "没有重复的数组元素。";
}