# MCP PHP SDK Guides

- [MCP Elements](mcp-elements.md) — Core capabilities (Tools, Resources, Resource Templates, and Prompts) with registration methods.
- [Server Builder](server-builder.md) — Fluent builder class for creating and configuring MCP server instances.
- [Client](client.md) — Client SDK for connecting to and communicating with MCP servers.
- [Transports](transports.md) — STDIO and HTTP transport implementations with guidance on choosing between them.
- [Server-Client Communication](server-client-communication.md) — Methods for servers to communicate back to clients: sampling, logging, progress, and notifications.
- [Protocol Extensions](extensions.md) — Opt-in protocol extensions announced during capability negotiation, including MCP Apps (HTML UI resources).
- [Authorization](authorization.md) — OAuth and authorization setup for the HTTP transport.
- [Events](events.md) — Hooking into the server lifecycle with PSR-14 events.
- [Examples](examples.md) — Example projects demonstrating attribute-based discovery, dependency injection, HTTP transport, and more.