PHP multi-dimensional array deduplication

/** * multi-dimensional array to duplicate * @param$arr
 * @param $key
 * @return array
 */
function assoc_unique($arr.$key) {
    $tmp_arr = array();
    foreach ($arr as $k= >$v) {
        if (in_array($v[$key].$tmp_arr)) {
            unset($arr[$k]);
        } else {
            $tmp_arr[] = $v[$key]; }}$arr = array_values($arr); The sort function sorts the arrayreturn $arr;
}
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