获取客户端访问的ip地址

function real_ip()
{
static $realip = NULL; if ($realip !== NULL)
{
return $realip;
} if (isset($_SERVER))
{
if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
{
$arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']); /* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */
foreach ($arr AS $ip)
{
$ip = trim($ip); if ($ip != 'unknown')
{
$realip = $ip; break;
}
}
}
elseif (isset($_SERVER['HTTP_CLIENT_IP']))
{
$realip = $_SERVER['HTTP_CLIENT_IP'];
}
else
{
if (isset($_SERVER['REMOTE_ADDR']))
{
$realip = $_SERVER['REMOTE_ADDR'];
}
else
{
$realip = '0.0.0.0';
}
}
}
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');
}
} preg_match("/[\d\.]{7,15}/", $realip, $onlineip);
$realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0'; return $realip;
}

  

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