function get_keys_for_duplicate_values($my_arr, $clean = false) {

if ($clean) {

return array_unique($my_arr);

}

$dups = $new_arr = array();

foreach ($my_arr as $key => $val) {

if (!isset($new_arr[$val])) {

$new_arr[$val] = $key;

} else {

if (isset($dups[$val])) {

$dups[$val][] = $key;

} else {

$dups[$val] = array($key);

// Comment out the previous line, and uncomment the following line to

// include the initial key in the dups array.

// $dups[$val] = array($new_arr[$val], $key);

}

}

}

return $dups;

}

显然功能名称有点长;)

现在$dups将包含由重复值键入的多维数组,其中包含每个重复的键,如果发送“true”作为第二个参数,它将返回原始数组而不重复的值.

或者,您可以将原始数组作为参考传递,并在返回重复数组时相应调整它