What is the method for verifying ID number in php

In the process of website development, we often involve the verification of user information, including the verification of the user's ID number. In actual development, we usually use PHP to verify the legitimacy of the ID number to ensure that the information entered by the user is correct. Below we will introduce in detail the method of verifying the ID number in PHP.

1. The basic format of the ID number

Before verifying the ID number, we first need to understand the basic format of the ID number.

The 18-digit ID number consists of 17 digits and 1 digit check code. Among them, the first 6 digits represent the household registration area code; the 7th to 14th digits represent the date of birth; the 15th to 17th digits represent the sequence code; and the 18th digit represents the check code.

2. How to verify ID number in PHP

php has a ready-made function that can verify the legitimacy of ID number, that is, the regular expression function preg_match() in PHP. Let's take a look at the specific implementation method:

1. First, introduce the regular expression pattern of the ID number.

$id_card_pattern = '/^\d{17}[0-9xX]$/';

2. Call the preg_match() function for verification.

preg_match($id_card_pattern, $id_card_number);

Among them, $id_card_pattern is the regular expression pattern of the ID number, and $id_card_number is the ID number that needs to be verified.

3. Judge the verification result and output the error message

if (! preg_match($id_card_pattern, $id_card_number)) {
echo "The format of the ID number is incorrect! ";
} else {
// Process the verification results and output success information
}

Through the above three steps, we can verify the ID number in PHP. At the same time, we can further improve the verification logic, such as obtaining date of birth, gender and other information based on the ID number to facilitate further operations.

3. Complete code example

$id_card_number = '510101198912123456';
$id_card_pattern = '/^\d{17}[0-9xX] $/';

if (! preg_match($id_card_pattern, $id_card_number)) {
echo "The format of the ID number is incorrect!";
} else {
// Get the identity Date of birth, gender and other information in the card number
$birthday = substr($id_card_number, 6, 8);
$gender = substr($id_card_number,16,1) % 2 == 0? 'Female' : 'Male';

echo "The format of the ID number is correct! Birthday: ".$birthday." Gender: ".$gender;
}
?>

Through the above code, we can complete the verification of the ID number and obtain the date of birth, gender and other information.

Summary:

The above is the method and code example of PHP verification of ID number. Using the regular expression function preg_match() can easily verify the ID number. In practical applications, we can improve the verification logic of ID numbers based on business needs to ensure that user information input is accurate. Of course, we can also use third-party tool libraries to complete ID number verification, such as the Validator class library that comes with the Laravel framework, making development more convenient.

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