PHP IP – 九创科技 https://www.3code.cn Wordpress外贸企业主题, Wp企业主题, wordpress企业主题, wordpress主题定制, WORDPRESS外贸网站建设SEO Mon, 02 Nov 2009 06:30:57 +0000 zh-Hans hourly 1 PHP获得用户的真实IP地址 https://www.3code.cn/php-true-ip/ Mon, 02 Nov 2009 06:30:57 +0000 https://www.3code.cn/?p=112 获得用户的真实IP地址

<?
/**
* 获得用户的真实IP地址
*
* @access  public
* @return  string
*/
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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