From the php.net manual page...
http://www.php.net/odbc_connect
I was getting the error:
Call to undefined function: odbc_connect()
on a machine with unixODBC compiled in php ('--with-unixODBC=shared,/usr' ), and I was wondering what was wrong since php.ini indicates that:
"Note that MySQL and ODBC support is now built in, so no dll is needed for it."
After installing php4-odbc and adding the line
extension=odbc.so
it worked.
Hope it helps others....