What are the php caching technologies?

php caching technologies include: 1. File caching technology, suitable for applications with low frequency of demand changes; 2. Memory caching technology, which can provide faster performance and reduce access to the file system, but requires Additional memory space; 3. Database caching technology, suitable for applications with frequent queries, which can reduce the load on the database server; 4. Page caching technology, suitable for static content that only needs to be updated regularly or does not need to be updated in real time; 5. Fragments Caching technology is suitable for web pages that need to be updated in real time, reducing access to databases and file systems.

The operating environment of this tutorial: Windows 10 system, PHP8.1.3 version, Dell G3 computer.

PHP caching technology is one of the core technologies to improve website performance and reduce server load. PHP caching technology can cache compiled PHP scripts and other static resources to reduce access to databases and file systems. This article will introduce some common PHP caching techniques.

1. File caching:

File caching is one of the simplest caching technologies. It saves the compiled PHP script in the file system. When there is a request, it directly reads the cache file, avoiding the time consumption of recompiling the PHP script. File caching is suitable for applications with less frequent demand changes, but file system read and write competition may occur.

2. Memory cache:

Memory cache is more efficient than file cache. It stores compiled PHP scripts in memory and can be implemented using PHP's built-in functions such as `apc`, `xcache` and `opcache`. Memory caching provides faster performance and reduces file system access, but requires additional memory space.

3. Database cache:

Database cache stores query results in the database, and you can use distributed cache systems like Memcached and Redis. When there is the same query request, the results are obtained directly from the cache instead of re-querying the database. Database caching is suitable for applications with frequent queries and can reduce the load on the database server.

4. Page caching:

Page caching saves dynamically generated pages as static HTML files, so that the same request can directly return the HTML file next time without running a PHP script. Common page caching technologies include `Varnish` and `nginx` caching modules. Page caching is suitable for static content that only needs to be updated periodically or does not need to be updated in real time.

5. Fragment caching:

Fragment caching is to cache the parts of the page that may change frequently. Only this part of the content is dynamically generated, while other content is obtained from the cache. Fragment caching can be implemented using functions such as `ob_start` and `ob_get_contents`. Fragment caching is suitable for web pages that need to be updated in real time and can reduce access to databases and file systems.

In practical applications, multiple caching technologies are often combined to improve performance, such as combining file caching and memory caching. At the same time, other caching technologies can also be used to accelerate different parts of the application. It is important to note that the choice of caching technology should be weighed against application needs and performance requirements.

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