Fatal error: Call to undefined function ociplogon() in

hi,

wamp 2.0 and phpr 10638.

Fatal error: Call to undefined function ociplogon() in C:\wamp\www\oracle\include\dbconnection.php on line 6
php.ini
extension=php_oci8.dll ; Use with Oracle 10gR2 Instant Client

extension=php_oci8_11g.dll ; Use with Oracle 11g Instant Client

and this dll are php/ext directory
but not connectin to oracle.
what is the problem?

best regards.