A developer is looking to use PHP with Couchbase Server as a NoSQL database. They need to install the Couchbase PHP SDK and configure their environment to work with Couchbase. The SDK provides an extension to PHP that enables communication between PHP applications and Couchbase databases. To use the SDK, they must obtain the necessary dependencies and add the Couchbase extension to their php.ini file. Once installed, they can perform CRUD (Create, Read, Update, Delete) operations on data stored in Couchbase using PHP. The developer can also create indexes on specific fields of documents to enable querying by those fields. Additionally, they can use N1QL, a SQL-like query language for NoSQL databases, to perform more complex queries on their data. By following these steps and examples, the developer can effectively integrate Couchbase into their PHP application.