<?php

interface MsgIterator
{
 public function First();
 public function Next();
 public function IsDone();
 public function CurrentItem();
}

// 正向迭代器
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];
 }
}

// 反向迭代器
class MsgIteratorDesc implements MsgIterator
{
 private $list;
 private $index;
 public function __construct($list)
 {
 // 反转数组
 $this->list = array_reverse($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);
 }
}
class MessageDesc implements Message
{
 public function CreateIterator($list)
 {
 return new MsgIteratorDesc($list);
 }
}

// 要发的短信号码列表
$mobileList = [
 '13111111111',
 '13111111112',
 '13111111113',
 '13111111114',
 '13111111115',
 '13111111116',
 '13111111117',
 '13111111118',
];

// A服务器脚本或使用swoole发送正向的一半
$serverA = new MessageAsc();
$iteratorA = $serverA->CreateIterator($mobileList);

while (!$iteratorA->IsDone()) {
 echo $iteratorA->CurrentItem(), PHP_EOL;
 $iteratorA->Next();
}

// B服务器脚本或使用swoole同步发送反向的一半
$serverB = new MessageDesc();
$iteratorB = $serverB->CreateIterator($mobileList);

while (!$iteratorB->IsDone()) {
 echo $iteratorB->CurrentItem(), PHP_EOL;
 $iteratorB->Next();
}