# API reference

Explore the API provided by the PHP SDK.

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Use the summary below to quickly jump to a specific topic:

- [Core](/reference/sdk/php/api/core): Discover the SDK entry point and operations.
- [Options](/reference/sdk/php/api/options): Discover the options provided by the SDK.
- [Response](/reference/sdk/php/api/response): Discover the responses and metadata provided by the SDK.
- [Content](/reference/sdk/php/api/content): Discover how to supply content to the SDK.
- [Storage](/reference/sdk/php/api/storage): Learn how the SDK persists the visitor session.
- [Resolvers](/reference/sdk/php/api/resolvers): Learn how the SDK resolves the visitor's identity and locale.
- [Authentication](/reference/sdk/php/api/authentication): Discover the classes that authenticate your application and identify visitors.
- [Exceptions](/reference/sdk/php/api/exceptions): Discover the exceptions thrown by the SDK.
- [Types](/reference/sdk/php/api/types): Discover the content types generated for your slots and components.