What are the caching technologies of PHP?

php caching technologies include: 1. File caching, one of the most basic and simple caching technologies, suitable for static data or page content; 2. Memory caching, a technology for caching data in memory; 3. Query caching, which stores query results in the cache so that the results can be obtained directly from the cache the next time you query; 4. Fragment caching, a technology that divides page content into small fragments and stores them in the cache; 5. Extended caching, a technology that improves the performance of PHP applications by using cache extensions.

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

PHP is a popular server-side scripting language used for developing web applications. When developing web applications, performance is a key consideration. To improve the performance of PHP applications, caching techniques can be used to reduce database query and page generation times. This article will introduce several common PHP caching technologies.

1. File caching

File caching is one of the most basic and simple caching technologies in PHP. It works by storing commonly used data or page content in a file and reading it directly from the file on the next request without having to perform database queries or page generation operations again. File caching works for static data or page content, such as configuration files and HTML fragments.

2. Memory cache

Memory cache is a technology that caches data in memory. There are many popular memory caching systems in PHP, such as Memcache, Redis, APC, etc. These systems provide high-speed memory storage with the ability to read and write data quickly. By storing data in memory, the responsiveness of your PHP application can be greatly improved.

3. Query cache

Query cache stores query results in the cache so that the results can be obtained directly from the cache the next time you query. Query caching can reduce the frequency of access to the database and improve the performance of database queries. In the MySQL database, query results can be cached by enabling query caching.

4. Fragment caching

Fragment caching is a technology that divides page content into small fragments and stores them in the cache. For some complex pages, only part of the content needs to be cached without regenerating the entire page every time. This caching technology can greatly improve page generation speed in some cases, such as in dynamic pages where only a small part of the content changes frequently, while other parts rarely change.

5. Extended caching

Extended caching is a technology that improves the performance of PHP applications by using cache extensions. For example, you can use the OPcache extension to cache PHP scripts into memory to avoid reparsing and compiling the script every time. Alternatively, a caching proxy server such as Varnish can be used to cache the entire page, thereby reducing the load on PHP and the database.

Summary:

There are many caching techniques in PHP that developers can choose from to improve application performance. File cache, memory cache, query cache, fragment cache and extended cache are five common caching technologies. Depending on different application scenarios, choosing appropriate caching technology can significantly improve the performance and response speed of PHP applications.

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