每日一模式之迭代器模式

<?php
//迭代器模式：可以循环访问某些参数
class myIterator implements Iterator {
private $position = 0;
private $array = array(
"firstelement",
"secondelement",
"lastelement",
);

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";
}