function cache_callback ( $output )
		{
			if ($hd = @fopen($this->cache_filename, 'w'))
			{
				fputs($hd,  $output);
				fclose($hd);
			}
			return $output;
		}
function cache_callback ( $output )
		{
			if ($hd = @fopen($this->cache_filename, 'w'))
			{
				fputs($hd,  $output);
				fclose($hd);
			}
			return $output;
		}
function cache_callback ( $ output ) { if ( $ hd = @ fopen ( $ this -> cache_filename , 'w' ) ) { fputs ( $ hd , $ output ) ; fclose ( $ hd ) ; } return $ output ; }
Output Buffer Callback Function

@access private
@param string $output
@return string $output
Output Buffer Callback Function