Async and non-blocking hostname to IP lookup

# swoole_async_dns_lookup

(PECL swoole >= 1.9.0)

swoole_async_dns_lookup — Async and non-blocking hostname to IP lookup

### 说明

function swoole_async_dns_lookup(string `$hostname`, callable `$callback`): bool

### 参数

`hostname`

  The host name.

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

    The host name.

  `IP`

    The IP address.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

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