What are the types of php caching technology?

php caching technologies include: 1. File caching, which is a simple and effective PHP caching technology; 2. Memory caching, which is an efficient caching technology; 3. Database caching, which caches commonly used queries The results are stored in the database to reduce the number of repeated queries; 4. Page caching, which stores dynamically generated pages as static files, and returns the static files directly on the next request without regenerating the page.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

In web development, caching technology is a key part of improving website performance and user experience. As a commonly used programming language, PHP also provides a variety of caching technologies to speed up the running of web applications. This article will introduce some common PHP caching technologies, including file caching, memory caching and database caching.

1. File caching

File caching is a simple and effective PHP caching technology. Its principle is to store the calculation results or query results in a file, and read the file directly without recalculation the next time the same input parameters are used. File caching is suitable for scenarios where the frequency of reading and writing data is low, such as configuration files or static pages.

PHP provides related functions to implement file caching, such as `file_put_contents()` and `file_get_contents()`. When using file caching, you need to pay attention to the selection of file paths and the validity period management of cached files.

2. Memory cache

Memory cache is an efficient caching technology that stores data in memory to improve access speed. The most common memory caching technology in PHP is to use an in-memory database such as memcached or Redis. These in-memory databases provide key-value storage functionality and support the storage of multiple data types.

When using memory cache, you can store query results or commonly used data in the memory database, and read it directly from the memory the next time you query. This can avoid frequent database access, reduce the load on the database, and improve response speed.

3. Database cache

Database cache stores commonly used query results in the database to reduce the number of repeated queries. In PHP, you can use the caching mechanism provided by the database itself, such as MySQL's query cache. The query cache caches query results in memory, and the next time the same query is read directly from the cache.

In addition to the caching mechanism provided by the database itself, you can also use the ORM (Object Relational Mapping) library for database caching. The ORM library will store query results in memory to provide faster query operations.

4. Page caching

Page caching stores dynamically generated pages as static files, and returns the static files directly on the next request without regenerating the page. PHP provides several page caching schemes, such as generating static HTML files through file operations, or using HTTP cache headers to control browser caching.

Page caching is suitable for relatively static pages and can greatly reduce server load and response time. However, you need to pay attention to updating cache files in time to ensure timely updating of data.

To sum up, PHP provides a variety of caching technologies to improve the performance and user experience of web applications. Depending on the scenarios and requirements, you can choose appropriate caching technology to optimize the running efficiency of the application. Using caching technology can reduce server load, improve response speed, and provide users with a better experience. .

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