IteratorAggregate（聚合式迭代器）接口

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简介

创建外部迭代器的接口。

接口摘要

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

Example #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 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";
}
?>

以上例程的输出类似于：

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"

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