PHP common class organization_PHP tutorial
Chart Library
The following class library allows you to easily create complex charts and pictures. Of course, they require support from the GD library.
pChart - A library for creating statistical charts.
Libchart - This is also a simple statistical gallery.
JpGraph - An object-oriented image creation class.
Open Flash Chart - This is a Flash-based statistical chart.
RSS parsing
Interpreting RSS is not a very tedious task, but fortunately you have the following class library to help you easily read RSS feeds.
MagpieRSS - An open source RSS parser for PHP, said to be powerful but not verified.
SimplePie - This is a very fast and easy-to-use RSS and Atom parsing library.
Thumbnail generation
phpThumb - The function is very powerful. It’s up to you to experience how powerful it is.
Payment
Does your website need to handle payments? Need a program with a payment gateway? The following program can help you.
PHP Payment Library - supports Paypal, Authorize.net and 2Checkout (2CO)
OpenID
PHP-OpenID - A PHP library that supports OpenID. OpenID is a solution that helps you log into different websites using the same username and password. If you are not familiar with OpenID, you can check it out here: http://openid.net.cn/
Data is abstract/object relational mapping ORM
ADOdb - Database abstraction
Doctrine - Object relational mapper (ORM), requires PHP 5.2.3+ version, a very powerful database abstraction layer (DBAL).
Propel - Object Relational Mapping Framework - PHP5
Outlet - is also a tool for object-relational mapping.
Note: Object Relational Mapping (ORM) is a technology designed to solve the mismatch between object-oriented and relational databases. Simply put, ORM automatically persists objects in a program into a relational database by using metadata that describes the mapping between objects and databases. Essentially converting data from one form to another. This also implies additional execution overhead; however, if the ORM is implemented as a middleware, there are many opportunities for optimizations that do not exist in a hand-written persistence layer. More importantly, the metadata used to control transformations needs to be provided and managed; but again, these costs are less than maintaining a handwritten solution; and even ODMG-compliant object databases still require class-level metadata.
PDF Generator
FPDF - This is a pure PHP library that allows you to generate PDF.
Excel related
Does your site need to generate Excel? No problem, the following two libraries allow you to do this easily.
php-excel - This is a very simple Excel file generation class.
PHP Excel Reader - can parse and read data in XLS files.
E-Mail related
Don’t like PHP’s mail function? Don’t feel strong enough? The following PHP email-related libraries will definitely not let you down.
Swift Mailer - Free super multifunctional PHP email library.
PHPMailer - Super powerful email sending class.
Unit testing
If you are using a test-driven approach to develop your program, the following libraries and frameworks will definitely help you in your development.
SimpleTest - A PHP unit testing and web page testing framework.
PHPUnit - From the xUnit family, it provides a framework that allows you to easily carry out unit test case development. And its test results can be analyzed very easily.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software