php7.2 废弃each 函数 代替函数写法

<?php
$b = array();
// each($b);
fun_adm_each($b);

    function fun_adm_each(&$array)
    {
        $res = array();
        $key = key($array);
        if ($key !== null) {
            next($array);
            $res[1] = $res['value'] = $array[$key];
            $res[0] = $res['key'] = $key;
        } else {
            $res = false;
        }
        return $res;
    }