At the moment we are using apache as our php application webserver.
After hours of reading about replacing apache with nginx and reading advanced solutions, we can't find the answer for the following issue:

At the moment we are using SEO friendly url's which look like this (the php files have no extension) :
http://www.example.com/par1/par2/par3/par4

Two cases :

E.g : http://www.example.com/directory/script/par3/par4
Apache executes : <root_directory>/directory/script
Path_info : /par3/par4

E.g. : http://www.example.com/script/par2/par3/par4
Apache executes : <root_directory>/script
Path_info : /par2/par3/par4

Because Apache is able to scan the directories it is able to split the URI in the script path and the path_info.
In Nginx we can't find a methode to determ the realpath and pass it to the fastcgi php socket.
We tried complex regex functions on te uri but we cannot manage to loop the results using try_files of if statements.

Maybe we are taking the wrong aproach for the solution but can anyone advise us how to solve this issue.

Thanks