Cached function calling

Cache.Extention.php

    /**
      * call_user_func_array_cached
      *
      * @param   function, variable args
      * @return  object
      */
          
     function call_user_func_array_cached( $function, $param_arr )
     {
         // ----------------------------------------------------------
         // Cached version of call_user_func_array, use only for TRUE
         // function, i.e. function whose result only depend on args
         // ----------------------------------------------------------

         if ( is_array( $function ) )
         {
             if ( is_object( $function[0] ) )
             {
                 $mangled_name = 'obj'. get_class( $function[0] ) .
 $function[1] . serialize( $param_arr );
             }
             else
             {
                 $mangled_name = $function[0] . $function[1] .
 serialize( $param_arr );
             }
         }
         else
         {
             $mangled_name = $function . serialize( $param_arr );
         }

         $cache_key = md5( __CLASS__ . $mangled_name );

         // ------------------------------------------------------------------
         // Mangle function signature and try to get from cache
         // ------------------------------------------------------------------

         $result = $this->get( $cache_key );
         if ( empty( $result) )
         {
             // ------------------------------------------------------------------
             // If not, call the function and get the result, we can only
             // cachify methods of subclasses of this class
             // ------------------------------------------------------------------

             $result = call_user_func_array( $function, $param_arr );

             // ------------------------------------------------------------------
             // Store the result in the cache for next time
             // ------------------------------------------------------------------

             $this->save( $cache_key, $result );
         }
         return $result;
     }

Put this in /system/libraries/Cache/Cached.php