set_include_path(get_include_path() . PATH_SEPARATOR . '../../.'); PHP: get_include_path() is showing me path .:/usr/lib/php:/usr/local/lib/php Directory structure is like this - mws | --- samples --- Model --- Mock Where "samples" folder have all code to test and execute files. What should i set in above line so that all files get auto include. Also, please can someone explain whats actually happening in this line set_include_path(get_include_path() . PATH_SEPARATOR . '../../.');