Implementation method of user registration and login function in PHP development of grocery shopping system

How to implement user registration and login functions in PHP development of grocery shopping system

With the rapid development of the Internet, the e-commerce industry has flourished. Among them, the food shopping system has also become a rapidly rising field. The vegetable shopping system provides users with a convenient and fast way to purchase fresh food and vegetables. The user registration and login functions have become an essential part of the grocery shopping system. Next, we will introduce how to implement the user registration and login functions of the grocery shopping system developed in PHP.

1. Database design

Before starting to develop the user registration and login functions, you first need to design the database. The user registration and login functions of the grocery shopping system need to save the user's personal information, and the user password needs to be encrypted and stored. Therefore, a user table needs to be designed to save user-related information.

The user table can include the following fields:

1. User ID (user_id): an ID used to uniquely identify the user, and can use an auto-incrementing primary key.
2. Username (username): The username used when the user registers and is used to log in to the system.
3. Password (password): User password, which needs to be encrypted and stored.
4. Email (email): The user's email address, which can be used to retrieve the password.
5. Mobile phone number (phone): The user’s mobile phone number, which can be used to receive relevant notifications.
6. Registration time (reg_time): The time when the user registered.

2. Implementation of user registration function

The user registration function is an important part of the grocery shopping system. Users need to create an account through the registration function in order to subsequently log in to the system for shopping. The following are the steps to implement the user registration function:

1. Create a registration page (register.php) to display the user registration form.
2. Users fill in user name, password, email and other information on the registration page, and click the registration button.
3. The background PHP code receives the form data submitted by the user.
4. Verify the validity of the data submitted by the user, such as whether the user name already exists, whether the password meets the requirements, etc.
5. If the verification passes, insert the data submitted by the user into the user table and prompt the user to successfully register.
6. If the verification fails, an error message will be returned to the user, prompting the user to refill the registration form.

3. Implementation of user login function

The user login function is another important function in the grocery shopping system. Users can use the registered account to shop through the login function. The following are the steps to implement the user login function:

1. Create a login page (login.php) to display the user login form.
2. The user fills in the user name, password and other information on the login page, and clicks the login button.
3. The background PHP code receives the form data submitted by the user.
4. Query whether the user name exists in the user table and whether the password matches.
5. If there is a matching username and password, the user will be prompted to log in successfully and jump to the shopping page.
6. If there is no matching username and password, an error message is returned to the user and prompts the user to refill the login form.

4. Password encrypted storage

When a user registers, the user's password needs to be encrypted and stored to ensure the security of the user's account. Commonly used password encryption algorithms include MD5, SHA1, bcrypt, etc. The following is a sample code for using MD5 for password encrypted storage:

$password = $_POST['password']; // 用户提交的密码
$hashed_password = md5($password); // 对密码进行MD5加密

It should be noted that the MD5 encryption algorithm is not the most secure encryption algorithm. It is recommended to use a more secure encryption algorithm, such as bcrypt.

Summary:

User registration and login functions are an essential part of the grocery shopping system. These two functions can be easily achieved through PHP development. First, the database needs to be designed, and then the functions of user registration and user login need to be implemented respectively. At the same time, the user's password needs to be encrypted and stored to protect the security of the user's account.

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