search
HomeBackend DevelopmentPHP ProblemHow to implement the function of changing login password in php? (code example)

In website development, the user account system is an essential part, and security is one of its core. In order to ensure the security of users' accounts, it is very necessary to provide the function of changing login passwords. Implementing this function requires writing some code. Let's take a look at how to write PHP code to modify the login password.

First, we need to create a password change form to provide users with an operable interface. Here, we use simple HTML code:


    旧密码:
    新密码:
    确认新密码:
    

The POST method is used in the form and submitted to the modifypwd.php file for processing. The form includes input boxes for entering the old password, new password, and password confirmation. The types of all input boxes are password types, and the content entered by the user will not be displayed.

Next, we start writing PHP code to process the form data submitted by the user. In the modifypwd.php file, we can use the following code to obtain the form data:

$oldpwd = $_POST['oldpwd'];
$newpwd = $_POST['newpwd'];
$newpwd2 = $_POST['newpwd2'];

The above code obtains the old password, new password and confirmation password entered by the user in the form through the $_POST variable. At this time, we need to perform some data legality checks to ensure the correctness and security of user input data. For example, determine whether the new password entered by the user is consistent with the confirmed password:

if ($newpwd !== $newpwd2) {
    echo '两次输入的新密码不一致';
    exit;
}

Next, we need to obtain the user's old password from the database and verify whether the old password is correct. It is assumed here that we have stored the user's account and password information in the user table, and the password is stored using MD5 encryption. You can use the following code to judge:

$oldpwd_md5 = md5($oldpwd);
$sql = "SELECT pwd FROM user WHERE username='xxx' and pwd='$oldpwd_md5'";
$result = mysqli_query($conn, $sql);
if (!$result || mysqli_num_rows($result) !== 1) {
    echo '旧密码输入错误';
    exit;
}

Among them, we use the md5() function to encrypt the old password entered by the user, and then obtain the user's password information from the database to determine whether it is consistent with the entered password. . Here xxx represents the username.

Finally, if there is no problem with the data entered by the user, we need to encrypt and store the new password in the database:

$newpwd_md5 = md5($newpwd);
$sql = "UPDATE user SET pwd='$newpwd_md5' WHERE username='xxx'";
if (!mysqli_query($conn, $sql)) {
    echo '密码修改失败';
    exit;
}
echo '密码修改成功';

The update statement is used to encrypt the user's new password and update it to the database. At this point, the process of changing the password has been completed.

To sum up, the above is the PHP code to change the login password. When writing such functions, you need to pay attention to data security. We can ensure the security of user data through encryption, data verification and other means. At the same time, for operations that modify the database, transaction processing is required to ensure the integrity and consistency of the operations.

The above is the detailed content of How to implement the function of changing login password in php? (code example). For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
ACID vs BASE Database: Differences and when to use each.ACID vs BASE Database: Differences and when to use each.Mar 26, 2025 pm 04:19 PM

The article compares ACID and BASE database models, detailing their characteristics and appropriate use cases. ACID prioritizes data integrity and consistency, suitable for financial and e-commerce applications, while BASE focuses on availability and

PHP Secure File Uploads: Preventing file-related vulnerabilities.PHP Secure File Uploads: Preventing file-related vulnerabilities.Mar 26, 2025 pm 04:18 PM

The article discusses securing PHP file uploads to prevent vulnerabilities like code injection. It focuses on file type validation, secure storage, and error handling to enhance application security.

PHP Input Validation: Best practices.PHP Input Validation: Best practices.Mar 26, 2025 pm 04:17 PM

Article discusses best practices for PHP input validation to enhance security, focusing on techniques like using built-in functions, whitelist approach, and server-side validation.

PHP API Rate Limiting: Implementation strategies.PHP API Rate Limiting: Implementation strategies.Mar 26, 2025 pm 04:16 PM

The article discusses strategies for implementing API rate limiting in PHP, including algorithms like Token Bucket and Leaky Bucket, and using libraries like symfony/rate-limiter. It also covers monitoring, dynamically adjusting rate limits, and hand

PHP Password Hashing: password_hash and password_verify.PHP Password Hashing: password_hash and password_verify.Mar 26, 2025 pm 04:15 PM

The article discusses the benefits of using password_hash and password_verify in PHP for securing passwords. The main argument is that these functions enhance password protection through automatic salt generation, strong hashing algorithms, and secur

OWASP Top 10 PHP: Describe and mitigate common vulnerabilities.OWASP Top 10 PHP: Describe and mitigate common vulnerabilities.Mar 26, 2025 pm 04:13 PM

The article discusses OWASP Top 10 vulnerabilities in PHP and mitigation strategies. Key issues include injection, broken authentication, and XSS, with recommended tools for monitoring and securing PHP applications.

PHP XSS Prevention: How to protect against XSS.PHP XSS Prevention: How to protect against XSS.Mar 26, 2025 pm 04:12 PM

The article discusses strategies to prevent XSS attacks in PHP, focusing on input sanitization, output encoding, and using security-enhancing libraries and frameworks.

PHP Interface vs Abstract Class: When to use each.PHP Interface vs Abstract Class: When to use each.Mar 26, 2025 pm 04:11 PM

The article discusses the use of interfaces and abstract classes in PHP, focusing on when to use each. Interfaces define a contract without implementation, suitable for unrelated classes and multiple inheritance. Abstract classes provide common funct

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment