PhpCollections

Interfaces

Legend:

• green - interfaces
• light blue - abstract class
• dark blue - concrete class

Interfaces above line are part of PHP standard library. Not all abstract and concrete classes are shown.

Interface structure in Collections library:

• IterableOnce<T> contains methods for collections that allow iterations (mapping, filtering, folding, reducing, counting). It extends IteratorAggregate<int,T> interface from PHP standard library, which allows using instances in foreach loops. All collection classes in this library implement that interface.
• Collection<T> extends IterableOnce<T> and adds support for collections that can contain more then one element. All collection classes in this library except for Optional<T> implement that interface.
• CollectionWithKey<K,V> is the first collection interface that predicts accessing collection by some key with get($key) method. It extends ArrayAccess<K,V> interface from PHP standard library, allowing usage of [$key] operator as well, and defines an __invoke(K $key): V method, allowing to treat collection as a function that accepts values of type K and return values of type V.
• IndexedCollection<T> is a basic interface for all collections in which keys are integer numbers from 0 to N-1, where N is a size of collection. It extends Collection<T> and CollectionWithKey<int,T>.
• Dictionary<K,V> is a basic interface for all dictionaries - collections of (key, value) pairs such that each possible key can appear at most once.

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