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                # IteratorAggregate(聚合式迭代器)接口 PHP?IteratorAggregate又叫聚合式迭代器,它提供了創建外部迭代器的接口 ## 簡介 創建外部迭代器的接口。 ## 接口摘要 ~~~ class IteratorAggregate extends Traversable { /* 方法 */ abstract public getIterator(): Traversable } ~~~ ## 實列 ~~~ <?php /** * 利用聚合式迭代器,并返回一個實現了Iterator接口的類的實例 * * @author zeng */ class myData implements IteratorAggregate { public $one = "one"; public $two = "two"; public $three = "three"; public function __construct() { $this->last = "property"; } public function getIterator() { return new ArrayIterator($this); //ArrayIterator迭代器會把對象或數組封裝為一個可以通過foreach來操作的類, } } $obj = new myData; foreach ($obj as $key => $value) { var_dump($key, $value); echo '<br>';// Linux:echo "\n"; } ~~~ 輸出 *string(3) "one" string(3) "one" string(3) "two" string(3) "two" string(5) "three" string(5) "three" string(4) "last" string(8) "property"*
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