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                ## Coroutine::gethostbyname 將域名解析為`IP`,基于同步的線程池模擬實現。底層自動進行協程調度。 ~~~ function Coroutine::gethostbyname(string $domain, int $family = AF_INET, double $timeout): string | bool ~~~ * `$domain`域名,如`www.baidu.com` * `$family`默認為`AF_INET`表示返回`IPv4`地址,使用`AF_INET6`時返回`IPv6`地址 * `$timeout`設置超時, 單位為秒 * 成功返回域名對應的`IP`地址,失敗返回`false`,可使用`swoole_last_error`獲取錯誤信息 ## 示例 ~~~ use Swoole\Coroutine as co; $ip = co::gethostbyname("www.baidu.com", AF_INET, 0.5); ~~~ <br> ## swoole\_async\_dns\_lookup\_coro 協程`DNS`查詢。與`co::gethostbyname`不同,`swoole_async_dns_lookup_coro`是基于`UDP`客戶端實現。不支持`/etc/hosts`配置。 <br> 函數原型: ~~~ function swoole_async_dns_lookup_coro(string $domain) : string | bool; ~~~ * 查詢成功返回對應的`IP`地址 * 失敗返回`false`,可使用`swoole_errno`和`swoole_last_error`得到錯誤信息
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