if you downloaded the full version of php 4, there should be a directory call EXTENSIONS, you must copy this archive php_oracle.dll to windows/system directory then open the php.ini in the windows directory and search for ";extension=php_oracle.dll" erase the comment "extension=php_oracle.dll" and is set to use oracle 8i... according to what php.net says it´s the same as working with oracle 8.x