downloaded x64 VC11 NTS.
copied php_couchbase.dll to the /wamp/bin/php/php_XXX/ext/ folder
copied libcouchbase.dll to the /wamp/bin/php/php_XXX/ folder
i even copied libcouchbase.dll to /windows/system32 and to apache’s bin folder
php.ini, added extension=php_couchbase.dll
wamp boots ok, but php logs says The specified module could not be found. in Unknown on line 0
since trying to make it work messed up my wamp, i decided to install the latest
with php 5.6
wamp does not ship php5.dll (NTS version), but rather php5ts.dll (ZTS version), so you used incorrect archive
when extension is loading, it looks up for libcouchbase.dll in the PATH or in current directory of the process so this DLL should be accessible there (for some reason OS keep removing libcouchbase.dll from C:\windows\system32.
when registering extension for CLI mode, use C:\wamp\bin\php\php5.5.12\php.ini, and for apache, use C:\wamp\bin\apache\apache2.4.9\bin\php.ini. The real INI file location you can always findout during runtime: