php身份证号的验证

//身份证号验证
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    protected function checkIdCard(){
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        if(empty($_POST['idcard'])){
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            return false;
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        }
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        $idcard = $_POST['idcard'];
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        $City = array(11=>"北京",12=>"天津",13=>"河北",14=>"山西",15=>"内蒙古",21=>"辽宁",22=>"吉林",23=>"黑龙江",31=>"上海",32=>"江苏",33=>"浙江",34=>"安徽",35=>"福建",36=>"江西",37=>"山东",41=>"河南",42=>"湖北",43=>"湖南",44=>"广东",45=>"广西",46=>"海南",50=>"重庆",51=>"四川",52=>"贵州",53=>"云南",54=>"西藏",61=>"陕西",62=>"甘肃",63=>"青海",64=>"宁夏",65=>"新疆",71=>"台湾",81=>"香港",82=>"澳门",91=>"国外");
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        $iSum = 0;
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        $idCardLength = strlen($idcard);
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        //长度验证
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        if(!preg_match('/^\d{17}(\d|x)$/i',$idcard) and!preg_match('/^\d{15}$/i',$idcard))
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        {
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            return false;
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        }
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        //地区验证
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        if(!array_key_exists(intval(substr($idcard,0,2)),$City))
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        {
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           return false;
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        }
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        // 15位身份证验证生日，转换为18位
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        if ($idCardLength == 15)
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        {
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            $sBirthday = '19'.substr($idcard,6,2).'-'.substr($idcard,8,2).'-'.substr($idcard,10,2);
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            $d = new DateTime($sBirthday);
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            $dd = $d->format('Y-m-d');
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            if($sBirthday != $dd)
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            {
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                return false;
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            }
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            $idcard = substr($idcard,0,6)."19".substr($idcard,6,9);//15to18
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            $Bit18 = getVerifyBit($idcard);//算出第18位校验码
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            $idcard = $idcard.$Bit18;
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        }
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        // 判断是否大于2078年，小于1900年
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        $year = substr($idcard,6,4);
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        if ($year<1900 || $year>2078 )
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        {
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            return false;
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        }
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        //18位身份证处理
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        $sBirthday = substr($idcard,6,4).'-'.substr($idcard,10,2).'-'.substr($idcard,12,2);
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        $d = new DateTime($sBirthday);
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        $dd = $d->format('Y-m-d');
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        if($sBirthday != $dd)
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         {
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            return false;
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         }
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        //身份证编码规范验证
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        $idcard_base = substr($idcard,0,17);
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        if(strtoupper(substr($idcard,17,1)) != getVerifyBit($idcard_base))
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        {
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           return false;
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        }
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        return $_POST['idcard'];
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    }
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    // 计算身份证校验码，根据国家标准GB 11643-1999
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    function getVerifyBit($idcard_base)
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    {
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        if(strlen($idcard_base) != 17)
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        {
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            return false;
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        }
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        //加权因子
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        $factor = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
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        //校验码对应值
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        $verify_number_list = array('1', '0', 'X', '9', '8', '7', '6', '5', '4','3', '2');
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        $checksum = 0;
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        for ($i = 0; $i < strlen($idcard_base); $i++)
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        {
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            $checksum += substr($idcard_base, $i, 1) * $factor[$i];
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        }
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        $mod = $checksum % 11;
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        $verify_number = $verify_number_list[$mod];
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        return $verify_number;
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    }