<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/7/18 0018
 * Time: 上午 2:30
 */

namespace app\extend;


class IdCardCheck
{
    public function IdCheck($value)
    {
        if (strlen($value) != 18) {
            return false;
        }
        $idcard_base = substr($value, 0, 17);
        if ($this->idcard_verify_number($idcard_base) != strtoupper(substr($value, 17, 1))) {
            return false;
        } else {
            return true;
        }
    }

    private function idcard_verify_number($value)
    {
        if (strlen($value) != 17) {
            return false;
        }
        //加权因子
        $factor = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
        //校验码对应值
        $verify_number_list = array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
        $checksum = 0;
        for ($i = 0; $i < strlen($value); $i++) {
            $checksum += substr($value, $i, 1) * $factor[$i];
        }
        $mod = $checksum % 11;
        $verify_number = $verify_number_list[$mod];
        return $verify_number;
    }

}