This is more important than that. PHP can't open couchbase.so at all, no matter if you use any couchbase functions or not. Just trying to start up php-fpm to load couchbase.so fails:
Starting php-fpm: [13-Dec-2012 14:08:49] NOTICE: PHP message: PHP Warning: PHP Startup: Unable to load dynamic library '/root/php-lib/php-ext-couchbase/couchbase.so' - /root/php-lib/php-ext-couchbase/couchbase.so: undefined symbol: php_couchbase_touch__multi_impl in Unknown on line 0
This was tested on Centos 5.8 and 6.3 (with install from the centos55 and centos62 rpms).
I recompiled couchbase.so from current master php-ext-couchbase, and it does work OK.
Please get a new 1.1 official release out as soon as possible. The current one is not usable at all.