EmptyIterator クラス

    (PHP 5 >= 5.1.0, PHP 7, PHP 8)

    はじめに

    空のイテレータ用の EmptyIterator クラスです。

    クラス概要

    class EmptyIterator implements Iterator {
    /* メソッド */
    public current(): never
    public key(): never
    public next(): void
    public rewind(): void
    public valid(): false
    }

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    User Contributed Notes 1 note

    up
    8
    Ben
    8 years ago
    Example use case:<?phpclass MyIterator implements IteratorAggregate{    /**     * @var string     */    private $url;    /**     * MyIterator constructor.     * @param $url     */    public function __construct($url)    {        $this->url = $url;    }    /**     * @inheritDoc     */    public function getIterator()    {        $content = file_get_contents($this->url);        try {            return @new SimpleXMLIterator($content);        } catch (Exception $e) { // Case $content is not valid XML, but you don't care            return new EmptyIterator();        }    }}?>
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