# IteratorAggregate（聚合式迭代器）接口

(PHP 5, PHP 7, PHP 8)

## 简介

创建外部迭代器的接口。

## 接口摘要

interface IteratorAggregate extends Traversable {
/* 方法 */
public getIterator(): Traversable
}

## 示例

示例 #1 基本用法

`<?php
class myData implements IteratorAggregate
{
public $property1 = "Public property one";
public $property2 = "Public property two";
public $property3 = "Public property three";
public $property4 = "";
public function __construct()
{
$this->property4 = "last property";
}
public function getIterator(): Traversable
{
return new ArrayIterator($this);
}
}
$obj = new myData();
foreach ($obj as $key => $value) {
var_dump($key, $value);
echo "\n";
}
?>`

以上示例的输出类似于：

    string(9) "property1"
    string(19) "Public property one"

    string(9) "property2"
    string(19) "Public property two"

    string(9) "property3"
    string(21) "Public property three"

    string(9) "property4"
    string(13) "last property"

## 目录

- IteratorAggregate::getIterator — 获取一个外部迭代器或可遍历对象

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