如何在Swoole中使用协程实现高并发的swoole_imap_fetch函数

co::set(['hook_flags' => SWOOLE_HOOK_ALL]);

function swoole_imap_fetch_async($imap_stream, $msg_number, $options = 0) 
{ 
    return new AsyncImapFetch($imap_stream, $msg_number, $options); 
} 

class AsyncImapFetch 
{ 
    private $imap_stream; 
    private $msg_number; 
    private $options; 
    private $deferred; 

    public function __construct($imap_stream, $msg_number, $options = 0) 
    { 
        $this->imap_stream = $imap_stream; 
        $this->msg_number = $msg_number; 
        $this->options = $options; 
        $this->deferred = new SwooleCoroutineChannel(1); 
        SwooleCoroutine::create([$this, 'execute']); 
    } 

    public function execute() 
    { 
        $result = swoole_coroutine::sleep(1); // 模拟网络IO等待 
        $ret = swoole_imap_fetch($this->imap_stream, $this->msg_number, $this->options); 
        $this->deferred->push($ret); 
    } 

    public function getResult() 
    { 
        return $this->deferred->pop(); 
    } 
}

$imap_stream = imap_open('{imap.xxx.com:993/imap/ssl}INBOX', 'user', 'pass'); 

// 异步获取邮件信息 
$async_fetch = swoole_imap_fetch_async($imap_stream, 1, FT_UID); 

// 其他操作 
// ... 

$ret = $async_fetch->getResult(); // 获取获取邮件结果 

imap_close($imap_stream); 

print_r($ret); // 输出获取的结果