Analysis of the reasons for the high execution efficiency of PHP caching technology

With the booming development of the Internet, websites have increasingly higher requirements for performance. As a widely used scripting language, PHP occupies an important position in website development. However, the execution efficiency of PHP itself is not high, which requires us to use some caching technology to improve its performance.

1. Overview of PHP caching technology
Caching technology is to save some results that consume a lot of system performance in memory for next time use. Caching technologies in PHP include: file caching, memory caching, database caching, etc.

2. The reason why PHP caching technology has high execution efficiency

1. Reduces the number of queries to the database
   We know that the interaction with the database usually causes the website to run slower a factor. The use of caching technology can reduce the number of queries to the database, store some commonly used or important results in the cache, and read them directly from the cache next time, reducing the number of interactions with the database, thereby improving the running speed of the website.
2. Reduced the number of times of PHP parsing and compilation
   The parsing and compilation of PHP files also consumes a lot of performance. Using caching technology, files that have been parsed and compiled can be cached, and the next time they are read directly from the cache, the number of parsing and compilation times is reduced, thereby improving the execution efficiency of PHP.
3. Reduced the number of internal function executions
   Some functions built into PHP consume a lot of performance, such as database connection functions, file reading functions, etc. Using caching technology can avoid repeated execution of these built-in functions, thereby improving PHP execution efficiency.
4. Reduce network transmission time
   Using caching technology, some data can be cached in memory and read directly from memory next time, avoiding network transmission time, thus improving the execution efficiency of PHP.

3. Common caching technologies and application scenarios

1. File caching
   File caching saves the results in files on the hard disk, which is suitable for applications that do not require real-time Updated results, such as home page staticization, general configuration information, etc.
2. Memory cache
   Memory cache saves the results in memory and is suitable for some results that need to be updated in real time, such as the number of people online, clicks on articles, etc.
3. Database cache
   Database cache saves the results in the database and is suitable for some results that need to be updated frequently or that need to be shared between multiple servers.

IV. Conclusion
In website development, it is very important to improve the execution efficiency of PHP. The use of caching technology can reduce the number of queries to the database, reduce the number of PHP parsing and compilation times, reduce the number of executions of internal functions, reduce network transmission time, etc., thus improving the execution efficiency of PHP. Common caching technologies include file caching, memory caching, database caching, etc., which should be selected according to the application scenario.

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