What is php resident in memory? A brief analysis of two resident methods

PHP resident memory means that in web application development, code is loaded into memory and kept running without the need to reload and execute on each request. Therefore, compared to the traditional method of reloading and parsing PHP files for every request, using PHP resident memory can greatly improve the performance and response speed of web applications.

Specifically, there are two ways to use PHP resident memory: one is to use a resident process, and the other is to use a PHP extension.

The resident process method refers to using a web server front-end similar to Nginx, Apache, etc. to separate an independent PHP process to run, and keep the process from being destroyed after each request is completed so that the next one can Requests can directly access PHP scripts in this process. This approach can significantly reduce the response time of each request and improve the performance of web applications. However, this method also has some shortcomings, such as the need to specify the number of processes in advance, large memory usage, and prone to memory leaks.

Another way is to use PHP extensions, such as Swoole, Workerman, etc., to implement PHP's resident memory. This method can convert PHP code into underlying C language code and run it in the process, thus improving the execution efficiency of PHP code. Using this approach, you can usually keep the CPU load low and the memory footprint small while handling high concurrent requests.

Of course, there are some issues that need to be paid attention to when using PHP's resident memory method. The first is the issue of memory management. Some commonly used PHP memory management functions such as unset, gc_collect_cycles, etc. may cause problems in a resident memory environment and require developers to pay special attention. In addition, the resident-memory method cannot meet all Web application scenarios, such as programs that need to dynamically load files.

In short, PHP resident memory is an effective means of optimizing web applications, but developers need to make flexible choices and uses according to actual conditions.

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