How to verify the validity of a mobile phone number using PHP regular expressions

With the popularity of mobile phones, mobile phone numbers have become an important way of our daily communication. When registering and logging in to some websites or apps, you will usually be asked to enter your mobile phone number for subsequent verification and operations. However, in order to ensure the accuracy and security of the information, the validity of the entered mobile phone number also needs to be verified. So, this article will introduce how to use PHP regular expressions to verify the validity of mobile phone numbers.

1. Standard mobile phone number format

When using regular expressions to verify mobile phone numbers, you first need to understand the standard format of mobile phone numbers. At present, the standard format of my country’s mobile phone numbers is 11 digits, of which the first three digits are the mobile phone network standard number range (for example, China Mobile’s number range is 134-139, 147, 150-152, 157-159, 182-189, etc.) , the last eight digits are the mobile phone number. Changes in the mobile phone number format may affect the verification effect, so you need to know the latest number segment information.

2. Regular expressions in PHP

Regular expressions in PHP use the preg_match function for matching, and its basic syntax format is:

preg_match ( string $pattern , string $subject [, array &$matches [, int $flags = 0 [, int $offset = 0 ]]] )

where , $pattern is the regular expression pattern, $subject is the string to be matched, $matches is the matching result, $flags is the matching flag, and $offset is the starting position of the match.

3. Regular expression for verifying mobile phone numbers

In PHP, the regular expression for verifying mobile phone numbers can be achieved by matching 11 digits while satisfying the rules for mobile phone numbers. accomplish. For different number segments such as China Mobile, China Unicom, and Telecom, you can write different regular expressions for different number segments.

Regular expression to verify mobile phone number:

/^((13[4-9]|147|15[0127-9]|178|18[23478]|198)d{8})$/

where, ^ represents the starting position of the string, $ represents the end position of the string, | represents or, [] represents optional Characters, d represents a number, {8} represents repetition 8 times, and brackets represent grouping.

Regular expression for verifying China Unicom’s mobile phone number:

/^((13[0-2]|145|15[56]|166|17[156]|18[56])d{8})$/

Regular expression for verifying China Telecom’s mobile phone number:

/^((133|149|153|173|177|180|181|189|199)d{8})$/

Comprehensive regular expression for the three operators:

/^((13[0-9]|14[5-9]|15[0123456789]|16[56]|17[0123456789]|18[0123456789]|19[89])d{8})$/

4. Implementation in PHP

Below, we use a simple PHP example to show how to use regular expressions to verify the validity of mobile phone numbers in PHP.

<?php
$mobile = '13123456789';   // 待验证的手机号码
$pattern = '/^((13[0-9]|14[5-9]|15[0123456789]|16[56]|17[0123456789]|18[0123456789]|19[89])d{8})$/';   // 手机号码的正则表达式
if (preg_match($pattern, $mobile)) {
    echo '手机号码验证成功';
} else {
    echo '手机号码验证失败';
}
?>

In the above code, we pass the mobile phone number to be verified and the regular expression for verifying the mobile phone number to the preg_match function, and use the function return value to determine the validity of the mobile phone number.

5. Summary

Through the above steps, we successfully used PHP regular expressions to verify the validity of the mobile phone number, effectively ensuring the accuracy and security of the information. . In actual projects, we can adjust the regular expression of mobile phone numbers according to different needs to meet actual business needs. At the same time, we also need to note that the performance and complexity of regular expressions will have a certain impact on the burden and maintenance difficulty of the system.

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