The EmptyIterator class
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
简介
The EmptyIterator class for an empty iterator.
目录
- EmptyIterator::current — The current() method
- EmptyIterator::key — The key() method
- EmptyIterator::next — The next() method
- EmptyIterator::rewind — The rewind() method
- EmptyIterator::valid — The valid() method
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User Contributed Notes 1 note
Ben ¶
5 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();
}
}
}
?>