How to write a simple online address book system through PHP

How to write a simple online address book system through PHP

Introduction:
With the development of the Internet, people increasingly need a convenient and efficient Address book system to manage your own contact information. In this article, we will learn how to write a simple online address book system using PHP. This article will provide specific code examples to help you understand and practice this system.

1. System Requirements Analysis
Before starting to write code, we must first clarify the system requirements and understand the user's basic functional requirements. According to the characteristics of the address book system, we can list the following function points:

1. User registration and login: Users can create their own address book system account by registering an account and entering a password, and use the account to log in system.
2. Add contacts: Users can add their own contacts in the system, including name, phone number, email address and other information.
3. Edit and delete contacts: Users can edit and delete added contacts, and view contact details.
4. Find contacts: Users can search for contacts by entering keywords to quickly find the contacts they need.
5. Import and export contacts: Users can import contact information into the system or export contact information from the system to other applications.

2. Database design
The address book system requires a database to store the user's account information and contact information. In this example, we will use a MySQL database and create two tables to store data.

1. User table (user):

   • id: user ID, primary key, auto-increment.
   • username: username, unique index.
   • password: Password.

2. Contact table (contact):

   • id: Contact ID, primary key, auto-increment.
   • userId: associated user ID, foreign key.
   • name: Contact name.
   • phone: Contact phone number.
   • email: Contact email.

3. System Implementation
Next, we will implement this simple online address book system through code examples.

1. User registration and login function
   (code example omitted)
2. Add contact function
   (code example omitted)
3. Edit and delete contacts People function
   (code example omitted)
4. Find contact function
   (code example omitted)
5. Import and export contact function
   (code example omitted)

4. Summary
Through the study of this article, we have learned how to use PHP to write a simple online address book system. During the implementation process, we first conducted demand analysis, then designed the database structure, and finally implemented each functional module of the system through specific code examples. This address book system is just a simple example. You can expand and optimize it according to your needs and actual conditions to make it more suitable for your actual application.

I hope this article will be helpful to you in learning and practicing PHP programming, thank you for reading!

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