Couchbase has released the second developer preview of its new PHP SDK, which features internal updates facilitated by the newly launched libcouchbase 2.4.0. This iteration includes enhancements such as a flexible URI-like cluster bootstrap list, support for SSL-encrypted communications, and cross-SDK datatype handling, making data exchange between PHP and other languages easier. Detailed API documentation is accessible online, and installation instructions are provided for both Linux and Windows systems, emphasizing the need for libcouchbase 2.4.0 to be installed beforehand. Users are encouraged to report any issues or bugs through Couchbase's community site or issue tracker for further assistance.