[...]
; cgi.fix_pathinfo provides *real* PATH_INFO/PATH_TRANSLATED support for CGI.  PHP's
; previous behaviour was to set PATH_TRANSLATED to SCRIPT_FILENAME, and to not grok
; what PATH_INFO is.  For more information on PATH_INFO, see the cgi specs.  Setting
; this to 1 will cause PHP CGI to fix its paths to conform to the spec.  A setting
; of zero causes PHP to behave as before.  Default is 1.  You should fix your scripts
; to use SCRIPT_FILENAME rather than PATH_TRANSLATED.
; http://php.net/cgi.fix-pathinfo
cgi.fix_pathinfo=1
[...]

[...]
##
## FastCGI (mod_fastcgi)
##
include "conf.d/fastcgi.conf"
[...]

#######################################################################
##
##  FastCGI Module
## ---------------
##
## http://www.lighttpd.net/documentation/fastcgi.html
##
server.modules += ( "mod_fastcgi" )

##
## PHP Example
## For PHP don't forget to set cgi.fix_pathinfo = 1 in the php.ini.
##
## The number of php processes you will get can be easily calculated:
##
## num-procs = max-procs * ( 1 + PHP_FCGI_CHILDREN )
##
## for the php-num-procs example it means you will get 17*5 = 85 php
## processes. you always should need this high number for your very
## busy sites. And if you have a lot of RAM. :)
##
fastcgi.server = ( ".php" =>
                   ( "php-local" =>
                     (
                       "socket" => socket_dir + "/php-fastcgi-1.socket",
                       "bin-path" => server_root + "/cgi-bin/php5",
                       "max-procs" => 1,
                       "broken-scriptfilename" => "enable",
                     )
                   ),
                   ( "php-tcp" =>
                     (
                       "host" => "127.0.0.1",
                       "port" => 9999,
                       "check-local" => "disable",
                       "broken-scriptfilename" => "enable",
                     )
                   ),

                   ( "php-num-procs" =>
                     (
                       "socket" => socket_dir + "/php-fastcgi-2.socket",
                       "bin-path" => server_root + "/cgi-bin/php5",
                       "bin-environment" => (
                         "PHP_FCGI_CHILDREN" => "16",
                         "PHP_FCGI_MAX_REQUESTS" => "10000",
                       ),
                       "max-procs" => 5,
                       "broken-scriptfilename" => "enable",
                     )
                   ),
                )
[...]

<?php
phpinfo();
?>