The Google API PHP Client Library is a development kit for interacting with Google Cloud services and APIs. It provides standardized service interfaces to retrieve and manipulate data, serving as a comprehensive SDK for executing network requests across Google cloud platforms.
The library features a specialized authentication handler for OAuth 2.0, managing authorization flows, access tokens, and offline access via refresh tokens. It includes a service account authenticator that uses JSON key files or application default credentials for server-to-server communication, as well as mechanisms for domain and user account impersonation.
The project covers a broad range of capabilities, including identity token verification, cloud file management via multipart upload streams, and API response caching. It also provides tools for HTTP request signing, custom middleware configuration, and dependency management to reduce the deployment footprint.
The client supports diagnostic integration through event logging and HTTP traffic inspection via web proxies.
