The KeyedTraversable interface

The KeyedTraversable<Tk, Tv> interface ¶

(HHVM >= 2.5)

Introduction ¶

Interface to detect if a class is traversable using foreach, of the form foreach($c => $k as $v).

Abstract base interface that cannot be implemented alone. Instead it must be implemented by KeyedIterator<Tk, Tv>.

Note:

Internal (built-in) classes that implement this interface can be used in a foreach construct and do not need to implement KeyedIterator<Tk, Tv>.

Note:

This is an internal engine interface which cannot be implemented in PHP scripts. KeyedIterator<Tk, Tv> must be used instead. When implementing an interface which extends KeyedTraversable<Tk, Tv>, make sure to listKeyedIterator<Tk, Tv> before its name in the implements clause.

Interface synopsis ¶

KeyedTraversable<Tk, Tv> extends Traversable<Tv> {

}

This interface has no methods, its only purpose is to be the base interface for all traversable<Tk, Tv> classes.