for new version, extension=mongo.dll is over date,
extension=mongodb.dll is right
Precompiled binaries for each release are available from ยป PECL for a variety of combinations of versions, thread safety, and VC libraries. Extract the archive and put php_mongo.dll in your PHP extension directory ("ext" by default).
Add the following line to your php.ini file:
extension=php_mongo.dll
for new version, extension=mongo.dll is over date,
extension=mongodb.dll is right