php—Traversable interface

Introduction

An interface to detect whether a class can be traversed using foreach.

Basic abstract interface that cannot be implemented alone. Instead it must be implemented by the IteratorAggregate or Iterator interface.

Note:

Built-in classes that implement this interface can use foreach for traversal without implementing the IteratorAggregate or Iterator interface.

Note:

This is an internal engine interface that cannot be implemented in PHP scripts. The IteratorAggregate or Iterator interface can be used instead.

Interface summary

Traversable {

}

This interface does not have any methods, its role is only as the basic interface for all traversable classes.