PHPのお勉強！

PHP TOP
PHP 8.4.2 Released!

    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
    }

    目次

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 1 note

    up
    12
    Ben
    7 years ago
    Example use case:

    <?php
    class 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();
    }
    }

    }
    ?>
    ＋add a note
    To Top