How to use data authenticity verification function in PHP

With the popularity of Internet applications, the requirements for data security are getting higher and higher. In PHP development, how to ensure the credibility of transmitted data is a very important issue. To this end, PHP provides a series of functions and classes to ensure the credibility of data, including data credibility verification functions. This article will introduce how to use the data credibility verification function in PHP to ensure the security and reliability of data.

1. What is the data credibility verification function?

The data credibility verification function is a function used to verify whether the data entered by the user is legal. It can check the type and length of the data. , format, etc., to ensure the reliability and security of data. Generally speaking, data credibility verification functions can be implemented through regular expressions, function libraries and other methods. These functions can be used to develop various types of websites, such as e-commerce websites, social networking websites, etc.

2. Classification of data credibility verification functions

In PHP, data credibility verification functions can be divided into the following categories:

1. Type verification function : Used to verify whether the input data type meets the requirements, including integer, floating point, string, etc.

2. Format verification function: used to verify whether the input data meets the specified format requirements, such as verifying email addresses, website addresses, phone numbers, etc.

3. Length verification function: Used to verify whether the length of input data meets the specified requirements, such as verifying the length of user name, password length, etc.

4. Range verification function: Used to verify whether the input data is within the specified range, such as verifying whether the number is within the specified range, verifying whether the date is within the specified range, etc.

5. Security verification function: used to verify whether the input data is safe, such as verifying whether the input contains SQL injection, XSS attacks, etc.

3. Implementation of data credibility verification function

In PHP, the data credibility verification function can be implemented through regular expressions and function libraries. Below we introduce these two implementation methods respectively.

1. Regular expression

Regular expression is a pattern used to describe a sequence of characters, usually used for string matching, search, replacement and other operations. In PHP, you can use regular expressions to implement data credibility verification functions. The following is an example of using regular expressions to verify mobile phone numbers:

function checkMobile($mobile){
    if(preg_match('/^1[3|4|5|7|8][0-9]d{8}$/',$mobile)){
        return true;
    }else{
        return false;
    }
}

This function uses the preg_match() function for matching. If the match is successful, it returns true, otherwise it returns false. In regular expressions, ^ represents the starting position of the string, $ represents the end position of the string, [3|4|5|7|8] represents a set of characters that can match any number in it, and d represents matching. Any number, {8} means that the number of numbers must be 8 digits.

2. Function library

In PHP, you can also use the function library to implement the data credibility verification function. PHP has some built-in data credibility verification functions, such as is_numeric() function, filter_var() function, etc. The following is an example of using the filter_var() function to verify the email:

function checkEmail($email){
    if(filter_var($email,FILTER_VALIDATE_EMAIL)){
        return true;
    }else{
        return false;
    }
}

This function uses the filter_var() function to verify. If the verification is successful, it returns true, otherwise it returns false. In the function, FILTER_VALIDATE_EMAIL means to verify whether the format of the email address is correct.

4. Application of data credibility verification function

In actual development, the data credibility verification function can be applied to form verification, back-end data verification, etc. For example, in form verification, the data credibility verification function can be used to verify whether the data entered by the user meets the requirements, thereby ensuring the reliability of the data. The following is an example of using the data credibility verification function to verify the login form:

if($_POST['username'] && $_POST['password']){
    $username = trim($_POST['username']);
    $password = trim($_POST['password']);

    if(checkUsername($username) && checkPassword($password)){
        //验证成功，执行登录操作
    }else{
        //验证失败
    }
}else{
    //表单未填写完整
}

In the back-end data verification, the data credibility verification function can be used to filter illegal data in the database and verify the interface transmission. Whether the input parameters are legal and so on. The following is an example of using the data credibility verification function to verify the incoming parameters of the interface:

function getUserInfo($userId){
    if(is_numeric($userId)){
        //执行查询操作
    }else{
        die('参数错误');
    }
}

getUserInfo($_GET['userId']);

In this example, the is_numeric() function is used to determine whether the incoming parameters are of numeric type, and if so, execute Query operation, otherwise an error message will be output.

Summary

The data credibility verification function is the core to ensure data security. In PHP development, developers must be proficient in the use of data credibility verification functions, which provides a strong guarantee for data security. This article introduces the classification, implementation and application of data credibility verification functions, hoping to be helpful to beginners in PHP development.

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