php-fpm
PHP FastCGI with Nginx? The answer: PHP-FPM server
Do you still use spawn-fcgi with Nginx? It's time to consider PHP-FPM.
PHP in the form in which it is available from php.net has a number of well-known issues associated with the use of the FastCGI SAPI in production. See this comparison chart of problems and how php-fpm handles them, when enabled with the FastCGI SAPI.
Features available only in PHP-FPM:

