php下获取客户端ip地址的函数

<div class="codetitle"><a style="CURSOR: pointer" data="74792" class="copybut" id="copybut74792" onclick="doCopy('code74792')"> 代码如下:<div class="codebody" id="code74792">
function getip() {
$IP=getenv('REMOTEADDR');
$IP = getenv('HTTP_X_FORWARDEDFOR');
if (($IP != "") && ($IP != "unknown")) $IP=$IP;
return $IP;
}

下面这个比较好的
<div class="codetitle"><a style="CURSOR: pointer" data="66506" class="copybut" id="copybut66506" onclick="doCopy('code66506')"> 代码如下:<div class="codebody" id="code66506">
function getIP()
{
if (isset($_SERVER)) {
if (isset($_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'];
}
} else {
if (getenv("HTTP_X_FORWARDED_FOR")) {
$realip = getenv( "HTTP_X_FORWARDED_FOR");
} elseif (getenv("HTTP_CLIENT_IP")) {
$realip = getenv("HTTP_CLIENT_IP");
} else {
$realip = getenv("REMOTE_ADDR");
}
}
return $realip;
}

（编辑：李大同）

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