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This article is to share with you about the differences between the four cache extensions commonly used by PHP. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

1 、 eAccelerator

EAccelerator is a free and open source PHP accelerator that optimizes and caches dynamic content, which improves the caching performance of PHP scripts and almost eliminates the overhead on the server when PHP scripts are compiled. It also optimizes scripts to speed up their execution. The implementation efficiency of PHP program code can be increased by 1-10 times. From the text can be understood as: eAccelerator is the PHP accelerator extension.

2 、 memcached

Memcached is a high-performance distributed in-memory object caching system, which is used for dynamic Web applications to reduce database load. It reduces the number of database reads by caching data and objects in memory, thus providing the speed of dynamic, database-driven websites. From the text, it can be understood as: memory cache expansion, and more use for cluster servers, mainly used for distributed cache, which can be regarded as database cache.

3. Alternative PHP Cache (APC cache)

Alternative PHP Cache (APC cache) is an effective open source cache tool for PHP, which can cache the PHP intermediate code of Opcode (target file). The cache of APC is divided into two parts: system cache and user data cache. The system cache is used automatically, which means that APC caches the compilation results of the source code of the PHP file, and then compares the time stamp when it is called again. If it does not expire, run it using cached code. Default cache 3600s (one hour). But it still wastes a lot of CPU time. So you can set the system cache to never expire (apc.ttl=0) in php.ini. However, if you set this up, you will need to restart your web server (such as apache …) after changing the PHP code. . At present, the performance test of APC generally refers to this layer of cache; from text to: Alternative PHP Cache (APC cache) is also a kind of in-memory cache extension, which can be regarded as database cache extension.

4 、 Xcache

Is an open source opcode cache / optimizer, it can improve the performance of PHP on the server, it can buffer the compiled PHP data to shared memory to avoid repeated compilation process, can directly use the buffer compiled code to improve speed. It can usually increase your page generation rate by 2 to 5 times and reduce the server load. In fact, it is a PHP Accelerator extension like eAccelerator.

Thank you for reading! This is the end of this article on "what are the differences between the four commonly used cache extensions in PHP". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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