# Swoole\Async::dnsLookup

(PECL swoole >= 1.9.0)

Swoole\Async::dnsLookup — Async and non-blocking hostname to IP lookup.

### 说明

public static Swoole\Async::dnsLookup(string `$hostname`, callable `$callback`): void

警告

本函数还未编写文档，仅有参数列表。

### 参数

`hostname`

  The host name.

`callback`
  callback(string `$hostname`, string `$ip`): mixed
  `hostname`

    The host name.

  `IP`

    The IP address.

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