# The Collection interface

(PECL ds >= 1.0.0)

## 简介

Collection is the base interface which covers functionality common to all the data structures in this library. It guarantees that all structures are traversable, countable, and can be converted to json using json_encode().

## 接口摘要

interface Ds\Collection extends Countable, IteratorAggregate, JsonSerializable {
/* 方法 */
public function clear(): void
public function copy(): Ds\Collection
public function isEmpty(): bool
public function toArray(): array
/* 继承的方法 */
public function Countable::count(): int
public function IteratorAggregate::getIterator(): Traversable
public function JsonSerializable::jsonSerialize(): mixed
}

## 更新日志

版本 | 说明
--- | ---
PECL ds 1.4.0 | Collection implements IteratorAggregate now instead of just Traversable. (This change came to the polyfill in 1.4.1.)

## 目录

- Ds\Collection::clear — Removes all values
- Ds\Collection::copy — Returns a shallow copy of the collection
- Ds\Collection::isEmpty — Returns whether the collection is empty
- Ds\Collection::toArray — Converts the collection to an array

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