How to use PHP regular expressions to verify whether the input string is the correct mobile phone number, landline number or 400 phone number format

In modern society, phone numbers are used very frequently, so it is very important to format the phone numbers entered by the user in the website or application. In PHP, you can use regular expressions to verify that a phone number is in the correct format. This article will introduce how to use PHP regular expressions to verify whether the input string is the correct mobile phone number, landline number or 400 phone number format.

1. Mobile phone number format verification

Mobile phone number refers to China’s mobile phone number, consisting of 11 digits, starting with 1. In PHP, you can use regular expressions to verify whether the input string is in the correct mobile phone number format.

The following is a regular expression to verify the format of mobile phone numbers:

/^1[34578]d{9}$/

The meaning of this regular expression is, Starting with 1, the second digit can be a number from 3, 4, 5, 7, or 8, followed by 9 numeric characters.

Apply this regular expression to PHP code, you can get the following code:

$phone_number = '13812345678';
if (preg_match('/^1[34578]d {9}$/', $phone_number)) {

echo '这是一个正确的手机号码';

} else {

echo '这不是一个正确的手机号码';

}

In this example, we assign a mobile phone number to $phone_number variable, and use the preg_match() function to verify whether the format of the mobile phone number is correct. If the verification passes, "This is a correct mobile phone number" will be output, otherwise "This is not a correct mobile phone number" will be output.

2. Landline number format verification

The landline number is also called a fixed phone number and consists of two parts: area code and phone number. In China, the area code of a landline number consists of 3 or 4 digits, and the telephone number consists of 7 or 8 digits. Therefore, in PHP, you can use regular expressions to verify that the input string is in the correct landline number format.

The following is a regular expression to verify the format of the landline number:

/^0d{2,3}-d{7,8}$/

This regular expression The meaning of the formula is that it starts with 0, followed by a 2 or 3-digit area code, followed by a hyphen "-", and finally a 7- or 8-digit phone number.

Apply this regular expression to PHP code, you can get the following code:

$phone_number = '010-12345678';
if (preg_match('/^0d{2 ,3}-d{7,8}$/', $phone_number)) {

echo '这是一个正确的座机号码';

} else {

echo '这不是一个正确的座机号码';

}

In this example, we will Assign a landline number to the $phone_number variable, and use the preg_match() function to verify whether the format of the landline number is correct. If the verification is passed, "This is a correct landline number" will be output, otherwise "This is not a correct landline number" will be output.

3. 400 phone format verification

The 400 phone number is a special phone number consisting of 10 digits, starting with 400. In PHP, you can use regular expressions to verify that the input string is in the correct 400 phone format.

The following is a regular expression to verify the 400 phone format:

/^400(-d{3,4}){2}$/

This regular expression The meaning of the formula is that it starts with 400, followed by 2 hyphens "-", followed by a 3 or 4 numeric character area code and a 7-digit phone number.

Apply this regular expression to PHP code, you can get the following code:

$phone_number = '400-1234-5678';
if (preg_match('/^400 (-d{3,4}){2}$/', $phone_number)) {

echo '这是一个正确的400电话号码';

} else {

echo '这不是一个正确的400电话号码';

}

In this example, We assign a 400 phone number to the $phone_number variable and use the preg_match() function to verify whether the format of the 400 phone number is correct. If the verification passes, "This is a correct 400 phone number" will be output, otherwise "This is not a correct 400 phone number" will be output.

Summary:

In PHP, it is very simple to use regular expressions to verify that the format of a phone number is correct. Just define a corresponding regular expression and use the preg_match() function to match the string. Through the introduction of this article, readers can learn how to verify the format of mobile phone numbers, landline numbers and 400 numbers, which will help increase their programming skills.

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