A ver, vamos por partes...
No tienes algo asi en tu php.ini???
Código:
[ODBC]
;odbc.default_db = Not yet implemented
;odbc.default_user = Not yet implemented
;odbc.default_pw = Not yet implemented
; Allow or prevent persistent links.
odbc.allow_persistent = On
; Check that a connection is still valid before reuse.
odbc.check_persistent = On
; Maximum number of persistent links. -1 means no limit.
odbc.max_persistent = -1
; Maximum number of links (persistent + non-persistent). -1 means no limit.
odbc.max_links = -1
; Handling of LONG fields. Returns number of bytes to variables. 0 means
; passthru.
odbc.defaultlrl = 4096
; Handling of binary data. 0 means passthru, 1 return as is, 2 convert to char.
; See the documentation on odbc_binmode and odbc_longreadlen for an explanation
; of uodbc.defaultlrl and uodbc.defaultbinmode
odbc.defaultbinmode = 1