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Homephp教程PHP源码php如何获取域名IP地址代码函数

<script>ec(2);</script>
 代码如下 复制代码
$dm = 'www.111cn.net';
$ip = gethostbyname($dm);
echo gethostbyaddr($ip);
echo $ip;

//两个输出结果是一样的,
/*
关于 gethostbyname语法

string gethostbyname ( string $hostname )

返回由主机名指定的互联网主机的ipv4地址
returns the ipv4 address of the internet host specified by hostname


下面有个例这是最好的方法我已经提出,以解决任何主机名称到ip地址时,它的快速,可靠,已超时的支持!一个无效的地址,例如unicode字符串,返回后4?秒,而不是8调用gethostbyname?!它只能与unix虽然。
*/

 代码如下 复制代码
function getaddrbyhost($host, $timeout = 3) {
   $query = `nslookup -timeout=$timeout -retry=1 $host`;
   if(preg_match('/ address: (.*) /', $query, $matches))
      return trim($matches[1]);
   return $host;
}

/*
gethostbyaddr 是获取internet主机名对应一个特定的ip地址

 代码如下 复制代码
string gethostbyaddr ( string $ip_address )

*/

 代码如下 复制代码

$hostname = gethostbyaddr($_server['remote_addr']);

echo $hostname;

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