# The IteratorAggregate interface

(PHP 5, PHP 7)

## Introduction

Interface to create an external Iterator.

## Interface synopsis

IteratorAggregate extends Traversable {
/* Methods */
abstract public getIterator ( void ) : Traversable
}

Example #1 Basic usage

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

The above example will output something similar to:

    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"

## Table of Contents

- IteratorAggregate::getIterator — Retrieve an external iterator