PHP Traversable interface

Introduction

Traversable is an abstract interface and therefore cannot be directly implemented by any class. Usually, the Iterator or IteratorAggregate interface inherits the Traversable interface, which is used to check whether the implementation class can traverse using the foreach structure in PHP.

Some built-in classes implement this interface and can be used in foreach without implementing the iterator interface. Since Traversable is an abstract interface, it does not have any methods of its own.

Syntax

Traversable {
   //
}

When implementing the IteratorAggregate or Iterator interface, they must be listed before the name in the implements clause.

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