La classe EmptyIterator

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

Introduction

La classe EmptyIterator crée un objet itérateur vide.

Synopsis de la classe

class EmptyIterator implements Iterator {

/* Méthodes */

public current(): never

public key(): never

public next(): void

public rewind(): void

public valid(): false

}

Sommaire

EmptyIterator::current — La méthode EmptyIterator::current
EmptyIterator::key — The key() method
EmptyIterator::next — La méthode EmptyIterator::next
EmptyIterator::rewind — La méthode EmptyIterator::rewind
EmptyIterator::valid — Vérifie si l'élément actuel est valide

Improve This Page

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

＋add a note

User Contributed Notes 1 note

down

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