i'm trying to access a oracle database with php4 (but it's in a php3 extension file) and the follow error occurs:

Fatal error: Call to undefined function: ora_logon() in c:\PHP\teste\frameset.php3 on line 2

with the php-3.0.16-win32 this error doesn't occur but i'm trying to convert it to php4 because of the session handling.

can someone tell me why this error happens? i'm trying to use php-4.0.1pl2-Win32.