迭代器模式

迭代都知道，其实就是foreach  对一个数组，对象，进行遍历，<br />提供一种方法顺序访问一个聚合函数对象中各个元素，而又不需暴露该对象的内部表示<br />定义游标指针，操作依次指向下一个，展示当前指针数据，遍历出所有数据<br />通过while 判断，foreach 的工作

interface MsgIterator
{
    public function First();
    public function Next();
    public function IsDone();
    public function CurrentItem();
}
// 迭代器
class MsgIteratorAsc implements MsgIterator
{
    private $list;
    private $index;
    public function __construct($list)
    {
        $this->list = $list;
        $this->index = 0;
    }
    public function First()
    {
        $this->index = 0;
    }
    public function Next()
    {
        $this->index++;
    }
    public function IsDone()
    {
        return $this->index >= count($this->list);
    }
    public function CurrentItem()
    {
        return $this->list[$this->index];
    }
}
interface Message
{
    public function CreateIterator($list);
}
class MessageAsc implements Message
{
    public function CreateIterator($list)
    {
        return new MsgIteratorAsc($list);
    }
}
// 要发的短信号码列表
$mobileList = [
    '13111111111',
    '13111111112',
    '13111111113',
    '13111111114',
    '13111111115',
    '13111111116',
    '13111111117',
    '13111111118',
];
// 服务器脚本
$serverA = new MessageAsc();
$iteratorA = $serverA->CreateIterator($mobileList);
while (!$iteratorA->IsDone()) {
    echo $iteratorA->CurrentItem(), PHP_EOL;
    $iteratorA->Next();
}