php 验证身份证号码

    function checkNum($num_id)
    {
   
        $num_id = strtoupper($num_id);
        $regx = "/^[1-9]\d{7}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}$|^[1-9]\d{5}[1-9]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}([0-9]|X)$/";
        $arr_split