Three ways Web server uses PHP to generate Web pages Summary _php tutorial

Found on the MySQL help document when looking for Mysql_pconnect, which is recorded here.

Web server uses PHP to generate a Web page with the following three kinds of three-way:

One: Use PHP as a CGI Wrapper. In this way, each request to reach the Web server causes a PHP parser process to be created, and when the PHP page executes, the PHP parser process terminates.

Second: In a multi-process Web server, PHP is used as a module of the Web server. This is currently the most popular practice, but currently only APAHCE used this way. A multi-process Web server typically has a total parent process that coordinates a heap of child processes to work. When a page request arrives at Web server, the parent process gives the request to a free child process to complete. Two requests from the same client are not necessarily handled by the same child process of the same Web server.

Three: In the multi-threaded Web server, PHP as a plug-in. For example, IIS uses this approach. It works the same way as multi-process work, but it uses threads rather than processes.

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