PHP中怎样来访获得IP地址?

PHP中怎样来访获得IP地址?
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echo gethostbyname("www.csdn.net")."

1<br/>

"
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// 取得客户IP
function get_client_ip()
{
global $_SERVER;
if (isset($_SERVER["HTTP_X_FORWARDED_FOR"]))
{
$realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
}
elseif (isset($_SERVER["HTTP_CLIENT_IP"]))
{
$realip = $_SERVER["HTTP_CLIENT_IP"];
}
else
{
$realip = $_SERVER["REMOTE_ADDR"];
}
return $realip;
}
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好象都很全面啊。
简单点 getenv('REMOTE_ADDR');

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