Shallow CGI, FastCGI, PHP-CGI, PHP-FPM!

Understanding of CGI and FastCGI

• CGI and FastCGI are both communication protocols , is a bridge for communication between web Sever (Apache/nginx/iis) and other programs (this program is usually called a CGI program, such as a PHP script parser)

• FastCGI is an improvement of CGI Evolved version, FastCGI is safer and has better performance than CGI, so now FastCGI protocol is used for communication

• FastCGI is compatible with CGI

PHP-CGI and PHP-FPM

• ##PHP-CGI is actually a PHP script parser, it is the implementation of the CGI protocol

• PHP-FPM is the implementation of the FastCGI protocol

• PHP-CGI and PHP-FPM are both programs

Execution process of CGI and FastCGI

• CGI

  
  

• FastCGI

  
  

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