The understanding of CGI and php-cgi and fast-cgi and PHP-FPM

Three ways to execute PHP interpreter:

1. mod_php: module form in apache; a single process can handle multiple requests

2. Cgi:Common Gateway Interface, Protocol

php-cgi: 1) The implementation of the CGI protocol to interpret the PHP request; procedure: php request->php-cgi Read and parse

PHP.ini file, initializing environment, Returning processing results based on request parameters

2) a single process can only process one request, and each process needs to read php.ini for parsing, less efficient

3) after modifying the php.ini file, start the PHP-CGI program will not take effect, unable to smooth restart

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3. Fast-cgi: optimized for CGI protocol, improved performance

php-fpm:1) Implementation of FAST-CGI protocol to parse PHP request, process: php request->php-fpm read

PHP.ini initialization environment, Start a master-> to start multiple worker->master and pass the request

Hand work->php-fpm Dynamic configuration of worker number

2) A single process processes multiple requests by starting multiple php-cgi programs

3) Modify the php.ini file, start a new worker, invoke the new configuration, and implement a smooth restart

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This article is from "a horse on the plains" blog, please be sure to keep this source http://huangzp.blog.51cto.com/12434999/1898910

CGI and php-cgi and fast-cgi and php-fpm understanding