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This article is about how PHP implements caching technology. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

PHP, a Web design scripting language that has sprung up in recent years, has made great progress in recent years because of its power and scalability. Compared with the traditional ASP website, PHP has an absolute advantage in speed. If it takes 40 seconds for mssql to convert 60, 000 data PHP, ASP will take no less than 2 minutes. However, as there is more and more data on the website, we are eager to call the data more quickly. We don't have to drop it from the database every time. We can get it from somewhere else, such as a file, or a certain memory address. This is PHP's caching technology, that is, Cache technology.

In-depth analysis

Generally speaking, the purpose of caching is to put data in one place to make access faster, there is no doubt that memory is the fastest, but can hundreds of megabytes of data be stored in? This is not realistic, of course, sometimes temporarily put such as the server cache, such as ob_start () this cache page opens, then the page content is cached in memory before sending the file header, until the page output is automatically clear or waiting for ob_get_contents to return, or is cleared by ob_end_clean display, which can be well used in the generation of static pages and can be well reflected in the template.

In addition, there is an object application in ASP, which can hold common parameters, which is also a point cache, but in PHP, I have not seen developers produce such objects. Indeed, it is not necessary. ASP.NET page caching technology uses viewstate, and cache is file association, (not necessarily accurate), files are modified, update cache, files are not modified and do not time out (Note 1), read cache and return results That's the idea. Take a look at the source code:

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