Predefined Interfaces and Classes
PHP Manual

The IteratorAggregate interface

Introduction

Interface to create an external Iterator.

Interface synopsis

IteratorAggregate extends Traversable
/* Methods */
public Traversable IteratorAggregate::getIterator()

Examples

Example #1 Basic usage

<?php

class myData implements IteratorAggregate
{
    public function getIterator(): Traversable
    {
        return new ArrayIterator([
            "key one" => "item one",
            "key two" => "item two",
            "key three" => "item three"
        ]);
    }
}

$obj = new myData();

foreach ($obj as $key => $value) {
    var_dump($key, $value);
    echo "\n";
}

The above example will output something similar to:

string(7) "key one"
string(8) "item one"

string(7) "key two"
string(8) "item two"

string(9) "key three"
string(10) "item three"
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