Setting PHP extension_dir path in php.ini not working as i expected

When i set the extension_dir in php.ini and use the full path like this, it works extension_dir = "/home/appie/Bureaublad/astroapp/phpdesktop-linux-72.1/ext" extension = "sweph.so" But if i do: extension_dir = "ext" extension = "sweph.so" or extension_dir = "./ext" extension = "sweph.so" Then it doesn't. For my program, i can't use full paths since the software can be placed in other directorys. So how to set the right path?