What are the PHP extension libraries?

php extension libraries include: 1. PDO, lightweight database abstraction layer; 2. OpenSSL, encrypt and decrypt data; 3. cURL, send and receive HTTP requests; 4. imagick, process images; 5. json, processes JSON data; 6. Redis, interacts with the Redis server; 7. memcached, interacts with the Memcached server; 8. zip, processes ZIP compressed files; 9. gd, processes images; 10. mysqli, an enhanced version of MySQL database, etc. .

The operating system of this tutorial: Windows10 system, PHP version 8.1.3, DELL G3 computer.

PHP is a popular server-side scripting language widely used for web development. Although PHP itself is already a powerful language, there are still some situations where external extension libraries are needed to implement some specific functions. In PHP, extension libraries refer to plug-ins provided in the form of dynamic link libraries. The functions and performance of PHP can be expanded through extension libraries.

The following are some commonly used PHP extension libraries:

1. PDO: PHP Data Objects is a lightweight database abstraction layer of PHP. It provides a unified set of interfaces to facilitate developers to switch between different databases.

2. OpenSSL: Extension library for encrypting and decrypting data. It supports a range of encryption algorithms, including symmetric and asymmetric encryption algorithms.

3. cURL: Extension library for sending and receiving HTTP requests. cURL supports various protocols, including HTTP, FTP, SMTP, etc., and can be used to send requests, upload files, etc.

4. imagick: Extension library for processing images. Imagick can perform operations such as scaling, cropping, and rotating images, and also supports conversion of various image formats.

5. json: Extension library for processing JSON data. json provides a set of functions that can convert PHP data to JSON format, or JSON data to PHP objects or arrays.

6. Redis: Extension library for interacting with the Redis server. Redis is a high-performance key-value storage system. Through the Redis extension library, PHP and Redis can be easily integrated.

7. memcached: Extension library for interacting with the Memcached server. Memcached is a distributed memory cache system. Through the memcached extension library, PHP and Memcached can be integrated to improve the performance of data reading.

8. zip: Extension library for processing ZIP compressed files. zip can create, open, read and write ZIP files, as well as extract, compress and delete files in ZIP files.

9. gd: Extension library for processing images. gd can create, edit and output images, supporting JPEG, PNG, GIF and other image formats.

10. mysqli: Enhanced version of MySQL database extension library. mysqli provides an interactive interface with the MySQL database and supports advanced features such as transactions, prepared statements, and stored procedures.

The above are some commonly used PHP extension libraries, which can provide PHP developers with richer and more efficient development tools and functional support. Developers can choose appropriate extension libraries according to their own needs to improve the performance and functionality of PHP applications.

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