L'interface Iterator

<?php
class myIterator implements Iterator {
	private $position = 0;
	private $array = array(
		"premierelement",
		"secondelement",
		"dernierelement",
	);  

	public function __construct() {
		$this->position = 0;
	}

	function rewind() {
		var_dump(__METHOD__);
		$this->position = 0;
	}

	function current() {
		var_dump(__METHOD__);
		return $this->array[$this->position];
	}

	function key() {
		var_dump(__METHOD__);
		return $this->position;
	}

	function next() {
		var_dump(__METHOD__);
		++$this->position;
	}

	function valid() {
		var_dump(__METHOD__);
		return isset($this->array[$this->position]);
	}
}

$it = new myIterator;

foreach($it as $key => $value) {
	var_dump($key, $value);
	echo "\n";
}
?>