phppath_info在nginx中失效问题

fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;fastcgi_param  QUERY_STRING       $query_string;fastcgi_param  REQUEST_METHOD     $request_method;fastcgi_param  CONTENT_TYPE       $content_type;fastcgi_param  CONTENT_LENGTH     $content_length;fastcgi_param  PATH_INFO          $path_info;