Container

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

Represents an entity that can be iterated over using foreach, without requiring a key, except it does not include objects that implement Iterator

The iteration variable will have a type of T.

In addition to Hack collections, PHP arrays are Containers.

Guides

• Introduction
• Interfaces

Interface Synopsis

namespace HH;

interface Container implements Traversable<Tv> {...}