PHP doesn't work using this nginx.conf file

nginx.conf

worker_processes  1;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    keepalive_timeout  65;

   
    server {
        listen       80;
        server_name  www.site.com site.com;

        #charset koi8-r;

        access_log  /srv/www/site.com/logs/access.log;
		error_log  /srv/www/site.com/logs/error.log;
		root   /srv/www/site.com/public_html;

        location / {
            index  index.html index.htm;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        location ~ \.php$ {
            include /etc/nginx/fastcgi_params;
            if ($uri !~ "^/images/") {
                fastcgi_pass unix:/var/run/php-fastcgi/php-fastcgi.socket;
            }
            fastcgi_index index.php;
            fastcgi_param SCRIPT_FILENAME /srv/www/site.com/public_html$fastcgi_script_name;
        }


    }

}