Since PHP 5.3, PHP now includes a FastCGI process manager that allows you to run much more secure, much faster and more reliable PHP code on web servers. Before PHP-FPM, the default way to run PHP code on a web server was usually through the mod_php module. What makes PHP-FPM so interesting is the possibility for it to adapt itself to the number of incoming requests and spawn new processes in a pool of workers in order to scale to the growing demand. Moreover, running PHP this way allows for better script termination, more graceful server restarts, more advanced error reporting and server logging, and fine-grained tuning of the PHP environment for each and every PHP pool of workers through the daemonization of the PHP binary.
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