Common caching design patterns in PHP

PHP is a commonly used server-side programming language that is widely used, especially in the field of web development. Due to the large number of website visits and large amounts of data, performance problems on PHP websites are relatively common, so the caching mechanism is an essential part. In PHP, there are some commonly used caching design patterns, and this article will introduce them.

1. Page caching mode

Page caching refers to caching page content into memory or disk to avoid fetching data from the database and rendering the page with each request. Page caching can be static or dynamic. Static page caching is usually used when page information is not updated frequently, such as the homepage of a website. Dynamic page caching generates a cache file based on the requested parameters. If the parameters of the next request are the same, the cache file is directly read and the results are returned, avoiding a large amount of CPU and database resource consumption.

2. Object caching mode

Object caching is to cache PHP objects in memory or disk to avoid having to re-create them every time and can be shared across requests. When implementing object caching, you usually need to use some caching libraries, such as Memcached cache, Redis cache, etc.

3. Query cache mode

Query cache mode refers to caching database query results into memory or disk to avoid re-querying the database every time. Query caching generally requires the use of some cache libraries, such as memcached cache, redis cache, APC cache, etc.

4. Fragment caching mode

Fragment caching refers to caching a certain part of the page, such as a certain list, an advertising space, etc., to avoid having to regenerate it every time. The difference between fragment caching and page caching is that page caching caches the entire page, while fragment caching only caches part of the content.

5. CDN Caching Mode

Content Delivery Network (CDN) refers to a network composed of multiple servers, located in multiple cities or even multiple countries. Its purpose is to Website static content (such as js, css, pictures, etc.) is cached on CDN nodes around the world to speed up user access. Using CDN caching can greatly reduce network transmission time and improve website performance.

6. Front-end caching mode

Front-end caching refers to caching static resource files, such as CSS, JS, images, etc., into the browser. When the user visits again, they can read them directly from the browser cache. fetch instead of sending a request to the server. Front-end caching can be implemented using technologies such as ETag and Last-Modified.

In PHP, the above caching design patterns are widely used. In actual development, it is necessary to choose the appropriate caching mode according to different situations and implement it in combination with some caching libraries. Caching can not only improve the performance of the website, but also reduce the burden on the server and improve the reliability and stability of the application.

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