Hi,
AFAIK php can use access only through an ODBC provider. You would have to set up an ODBC driver on the server.
I think,
the only 'external' databases php supports are the dbm style databases like Berkeley DB (read http://www.php.net/manual/en/ref.dba.php on that topic).
But you can't access it with SQL statements (without an ODBC driver) just with the functions provided by php. But with the php functions you can access that databases directly (even DB2 files)