php获取本土实际IP

php获取本地实际IP

? 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']);

??????????? 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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