How to verify age range of ID number using PHP regular expression

The ID card number is the only identity certificate for Chinese citizens, which contains personal identity information such as date of birth. In practical applications, it is sometimes necessary to verify the age range of ID numbers. PHP regular expressions are a very convenient way to implement this. This article will introduce how to use PHP regular expressions to verify the age range of an ID number.

1. ID card number structure

The ID card number consists of seventeen characters and is divided into six parts: the first two digits are the province code, and the middle four digits are the city and county code. The next two digits are the year code, the next two digits are the month code, the next two digits are the date code, and the last digit is the check digit. The specific structure is as follows:

xxxxxxxxxxxxxxXY

Among them, the first 17 digits are the main part of the ID number, X is any number in the first 17 digits of the ID number, and Y is the ID verification code. , its calculation method can refer to the provisions of the national standard GB 11643-1999 "Citizen Identity Card Number".

2. Basic idea

For age verification of ID number, we can get the date of birth from the ID number, and then compare it with the current date to calculate the ID card holding period. The age of the owner. The specific verification steps are as follows:

1. Obtain the date of birth in the ID number through regular expressions;
2. Convert the date of birth into a timestamp;
3. Through the current Calculate the current timestamp from the date;
4. Compare the current timestamp and the birth timestamp to obtain the age of the ID card holder;
5. Determine whether the age is within the specified range.

3. Regular expression

Using PHP’s preg_match function can easily obtain the date of birth in the ID number. The specific regular expression is as follows:

/(d{6})(d{4})(d{2})(d{2})d{2}(d)(d|x)/ i

Among them, the brackets of the regular expression are used to indicate the matching substring. The d in the brackets indicates a number, d{6} indicates matching six numbers, and d{4} indicates matching four numbers. And so on.

4. PHP code implementation

Using the regular expression provided above, the date of birth can be obtained through the preg_match function. The specific implementation code is as follows:

function getAgeByIdCard($idCard, $minAge, $maxAge)
{
    // 通过正则表达式获取身份证号码的出生年月日
    if (preg_match('/(d{6})(d{4})(d{2})(d{2})d{2}(d)(d|x)/i', $idCard, $matches))
    {
        list(,$birthYear,$birthMonth,$birthDay) = $matches;

        // 将出生年月日转化为时间戳
        $birthTimestamp = strtotime("{$birthYear}-{$birthMonth}-{$birthDay}");

        // 计算当前时间戳
        $currentTimestamp = time();

        // 计算身份证持有者的年龄
        $age = floor(($currentTimestamp - $birthTimestamp) / 31536000);

        // 判断年龄是否在指定范围内
        if ($age >= $minAge && $age <= $maxAge) {
            return true;
        }
    }
    
    return false;
}

// 身份证号码
$idCard = "320123199001011234";
// 最小年龄
$minAge = 18;
// 最大年龄
$maxAge = 60;

// 验证身份证号码是否在指定年龄范围内
if (getAgeByIdCard($idCard, $minAge, $maxAge)) {
    echo "身份证号码通过验证";
} else {
    echo "身份证号码不在指定年龄范围内";
}

5. Summary

This article introduces how to use PHP regular expressions to verify the age range of the ID number. Through the provided regular expression, you can easily obtain the date of birth in the ID number. Then use PHP's timestamp function to convert the date of birth into a timestamp, thereby calculating the age of the ID card holder. Through the implementation of this article, a convenient verification method can be provided for practical applications.

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