connecting sybase ASE 11.9.2 via ct-lib

I get Fatal error: Call to undefined function: sybase_connect() in c:\programmi\apache\apache\htdocs\hello_dati_syb.php this my php.ini ;extension=php_oracle.dll ;extension=php_pdf.dll ;extension=php_pgsql.dll ;extension=php_printer.dll ;extension=php_sablot.dll ;extension=php_snmp.dll extension=php_sybase_ct.dll ;extension=php_yaz.dll ;extension=php_zlib.dll ... .. [Sybase] ; Allow or prevent persistent links. sybase.allow_persistent = On ; Maximum number of persistent links. -1 means no limit. sybase.max_persistent = -1 ; Maximum number of links (persistent + non-persistent). -1 means no limit. sybase.max_links = -1 sybase.interface_file = "c:\sybase\ini\sql.ini" ; Minimum error severity to display. sybase.min_error_severity = 10 ; Minimum message severity to display. sybase.min_message_severity = 10 ; Compatability mode with old versions of PHP 3.0. ; If on, this will cause PHP to automatically assign types to results according ; to their Sybase type, instead of treating them all as strings. This ; compatability mode will probably not stay around forever, so try applying ; whatever necessary changes to your code, and turn it off. sybase.compatability_mode = Off [Sybase-CT] ;sybct.interface_file = "c:\sybase\ini\sql.ini" ; Allow or prevent persistent links. sybct.allow_persistent = On ; Maximum number of persistent links. -1 means no limit. sybct.max_persistent = -1 ; Maximum number of links (persistent + non-persistent). -1 means no limit. sybct.max_links = -1 ; Minimum server message severity to display. sybct.min_server_severity = 10 ; Minimum client message severity to display. sybct.min_client_severity = 10 [bcmath] ; Number of decimal digits for all bcmath functions. bcmath.scale = 0 TIA