include path confusion

I'm confused on what should be a simple issue - where does php look for an include file in the following example? My test results seem very confusing and the docs never mention it. In the program: include "../test/sample.php"; In php.ini: include_path="../include" Does php: A. Look in the dir "../test" for sample.php first and if not found, look in "../include" for sample.php? B. Ignore the dir "../test/" and look in "../include" for sample.php? C. Look in dir "../test" for sample.php and if not found, look in "../include" for "../test/sample.php"? (and can't find it as invalid) D. Look only in dir "../include" for "../test/sample.php"? (and can't find it as invalid) Does it work exactly the same for REQUIRE? TIA -- Best regards, Randy