The EmptyIterator class

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

简介

The EmptyIterator class for an empty iterator.

类摘要

class EmptyIterator implements Iterator {

/* 方法 */

public current(): never

public key(): never

public next(): void

public rewind(): void

public valid(): false

}

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();        }    }}?>

The EmptyIterator class

简介

类摘要

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