其它参考1

$_SERVER['REMOTE_ADDR']实际上可能不包含真实的客户端IP地址，因为它将为您提供通过代理连接的客户端的代理地址。那可能
不过，这取决于你对IP的做法。如果您说，试图查看您的流量源自何处，或者记住用户上次连接的IP，代理或NAT网关的公共IP可能位于何处，则某人的私有RFC1918地址可能对您没有任何帮助。更适合存储。


有几个HTTP标头，如X-Forwarded-For，可能会或可能不会由各种代理设置。问题是那些只是HTTP标头，任何人都可以设置。它们的内容无法保证。$_SERVER['REMOTE_ADDR']是Web服务器从其接收连接的实际物理IP地址，并且响应将被发送到。其他任何内容都只是任意和自愿的信息。只有您可以信任此信息的一种情况:您正在控制设置此标头的代理。只有当你知道100%在哪里以及如何设置标题时才意味着你应该注意它的重要性。


话虽如此，这里有一些示例代码:

if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
    $ip = $_SERVER['HTTP_CLIENT_IP'];
} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
    $ip = $_SERVER['REMOTE_ADDR'];
}

编者注:使用上面的代码有安全隐患。客户端可以将所有HTTP头信息(即$_SERVER['HTTP_...)设置为它想要的任意值因此，使用$_SERVER['REMOTE_ADDR']更加可靠，因为这不能由用户设置。


来自:http://roshanbh.com.np/2007/12/getting-real-ip-address-in-php.html [59]

其它参考2

echo $_SERVER['REMOTE_ADDR'];

http://php.net/manual/en/reserved.variables.server.php[60]

其它参考3

这是获取用户ip的好方法的清除代码示例。

$ip = $_SERVER['HTTP_CLIENT_IP']?$_SERVER['HTTP_CLIENT_IP']:($_SERVER['HTTP_X_FORWARDE‌​D_FOR']?$_SERVER['HTTP_X_FORWARDED_FOR']:$_SERVER['REMOTE_ADDR']);

这是一个使用elvis运算符的较短版本

$_SERVER['HTTP_CLIENT_IP']?:($_SERVER['HTTP_X_FORWARDE‌​D_FOR']?:$_SERVER['REMOTE_ADDR']);

这是一个使用isset删除通知的版本(谢谢，@ shasi kanth)

$ip = isset($_SERVER['HTTP_CLIENT_IP'])?$_SERVER['HTTP_CLIENT_IP']:isset($_SERVER['HTTP_X_FORWARDED_FOR'])?$_SERVER['HTTP_X_FORWARDED_FOR']:$_SERVER['REMOTE_ADDR'];

其它参考4

它应该包含在$_SERVER['REMOTE_ADDR']变量中。

其它参考5

我最喜欢的解决方案是Zend Framework 2使用的方式。它还考虑了$_SERVER属性HTTP_X_FORWARDED_FOR，HTTP_CLIENT_IP，REMOTE_ADDR，但它声明了一个类来设置一些可信任的代理，它返回一个IP地址而不是一个数组。我认为这是最接近它的解决方案:

class RemoteAddress
{
    /**
     * Whether to use proxy addresses or not.
     *
     * As default this setting is disabled - IP address is mostly needed to increase
     * security. HTTP_* are not reliable since can easily be spoofed. It can be enabled
     * just for more flexibility, but if user uses proxy to connect to trusted services
     * it's his/her own risk, only reliable field for IP address is $_SERVER['REMOTE_ADDR'].
     *
     * @var bool
     */
    protected $useProxy = false;

    /**
     * List of trusted proxy IP addresses
     *
     * @var array
     */
    protected $trustedProxies = array();

    /**
     * HTTP header to introspect for proxies
     *
     * @var string
     */
    protected $proxyHeader = 'HTTP_X_FORWARDED_FOR';

    // [...]

    /**
     * Returns client IP address.
     *
     * @return string IP address.
     */
    public function getIpAddress()
    {
        $ip = $this->getIpAddressFromProxy();
        if ($ip) {
            return $ip;
        }

        // direct IP address
        if (isset($_SERVER['REMOTE_ADDR'])) {
            return $_SERVER['REMOTE_ADDR'];
        }

        return '';
    }

    /**
     * Attempt to get the IP address for a proxied client
     *
     * @see http://tools.ietf.org/html/draft-ietf-appsawg-http-forwarded-10#section-5.2
     * @return false|string
     */
    protected function getIpAddressFromProxy()
    {
        if (!$this->useProxy
            || (isset($_SERVER['REMOTE_ADDR']) && !in_array($_SERVER['REMOTE_ADDR'], $this->trustedProxies))
        ) {
            return false;
        }

        $header = $this->proxyHeader;
        if (!isset($_SERVER[$header]) || empty($_SERVER[$header])) {
            return false;
        }

        // Extract IPs
        $ips = explode(',', $_SERVER[$header]);
        // trim, so we can compare against trusted proxies properly
        $ips = array_map('trim', $ips);
        // remove trusted proxy IPs
        $ips = array_diff($ips, $this->trustedProxies);

        // Any left?
        if (empty($ips)) {
            return false;
        }

        // Since we've removed any known, trusted proxy servers, the right-most
        // address represents the first IP we do not know about -- i.e., we do
        // not know if it is a proxy server, or a client. As such, we treat it
        // as the originating IP.
        // @see http://en.wikipedia.org/wiki/X-Forwarded-For
        $ip = array_pop($ips);
        return $ip;
    }

    // [...]
}

请在此处查看完整代码:
https://raw.githubusercontent.com/zendframework/zend-http/master/src/PhpEnvironment/RemoteAddress.php[61]

其它参考6

互联网背后有不同类型的用户，因此我们希望从不同的魔药中捕获IP地址。那是，


1。 $_SERVER['REMOTE_ADDR'] -
它包含客户端的真实IP地址。这是您可以从用户那里找到的最可靠的值。


2。 $_SERVER['REMOTE_HOST'] -
这将获取用户正在查看当前页面的主机名。
但是要使此脚本起作用，必须配置httpd.conf中的Hostname Lookups On。


第3。 $_SERVER['HTTP_CLIENT_IP'] -
当用户来自共享Internet服务时，这将获取IP地址。


4。 $_SERVER['HTTP_X_FORWARDED_FOR'] - 这将在用户位于代理后面时从用户处获取IP地址


因此，我们可以使用以下组合功能来获取在不同位置查看的用户的真实IP地址，

// Function to get the user IP address
function getUserIP() {
    $ipaddress = '';
    if (isset($_SERVER['HTTP_CLIENT_IP']))
        $ipaddress = $_SERVER['HTTP_CLIENT_IP'];
    else if(isset($_SERVER['HTTP_X_FORWARDED_FOR']))
        $ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
    else if(isset($_SERVER['HTTP_X_FORWARDED']))
        $ipaddress = $_SERVER['HTTP_X_FORWARDED'];
    else if(isset($_SERVER['HTTP_X_CLUSTER_CLIENT_IP']))
        $ipaddress = $_SERVER['HTTP_X_CLUSTER_CLIENT_IP'];
    else if(isset($_SERVER['HTTP_FORWARDED_FOR']))
        $ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
    else if(isset($_SERVER['HTTP_FORWARDED']))
        $ipaddress = $_SERVER['HTTP_FORWARDED'];
    else if(isset($_SERVER['REMOTE_ADDR']))
        $ipaddress = $_SERVER['REMOTE_ADDR'];
    else
        $ipaddress = 'UNKNOWN';
    return $ipaddress;
}

其它参考7

这是我发现的最先进的方法，过去已经尝试了其他方法。有效以确保获取访问者的IP地址(但请注意，任何黑客都可以轻松伪造IP地址)。

function get_ip_address() {
    // check for shared internet/ISP IP
    if (!empty($_SERVER['HTTP_CLIENT_IP']) && validate_ip($_SERVER['HTTP_CLIENT_IP'])) {
        return $_SERVER['HTTP_CLIENT_IP'];
    }

    // check for IPs passing through proxies
    if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        // check if multiple ips exist in var
        if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ',') !== false) {
            $iplist = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
            foreach ($iplist as $ip) {
                if (validate_ip($ip))
                    return $ip;
            }
        } else {
            if (validate_ip($_SERVER['HTTP_X_FORWARDED_FOR']))
                return $_SERVER['HTTP_X_FORWARDED_FOR'];
        }
    }
    if (!empty($_SERVER['HTTP_X_FORWARDED']) && validate_ip($_SERVER['HTTP_X_FORWARDED']))
        return $_SERVER['HTTP_X_FORWARDED'];
    if (!empty($_SERVER['HTTP_X_CLUSTER_CLIENT_IP']) && validate_ip($_SERVER['HTTP_X_CLUSTER_CLIENT_IP']))
        return $_SERVER['HTTP_X_CLUSTER_CLIENT_IP'];
    if (!empty($_SERVER['HTTP_FORWARDED_FOR']) && validate_ip($_SERVER['HTTP_FORWARDED_FOR']))
        return $_SERVER['HTTP_FORWARDED_FOR'];
    if (!empty($_SERVER['HTTP_FORWARDED']) && validate_ip($_SERVER['HTTP_FORWARDED']))
        return $_SERVER['HTTP_FORWARDED'];

    // return unreliable ip since all else failed
    return $_SERVER['REMOTE_ADDR'];
}

/**
 * Ensures an ip address is both a valid IP and does not fall within
 * a private network range.
 */
function validate_ip($ip) {
    if (strtolower($ip) === 'unknown')
        return false;

    // generate ipv4 network address
    $ip = ip2long($ip);

    // if the ip is set and not equivalent to 255.255.255.255
    if ($ip !== false && $ip !== -1) {
        // make sure to get unsigned long representation of ip
        // due to discrepancies between 32 and 64 bit OSes and
        // signed numbers (ints default to signed in PHP)
        $ip = sprintf('%u', $ip);
        // do private network range checking
        if ($ip >= 0 && $ip <= 50331647) return false;
        if ($ip >= 167772160 && $ip <= 184549375) return false;
        if ($ip >= 2130706432 && $ip <= 2147483647) return false;
        if ($ip >= 2851995648 && $ip <= 2852061183) return false;
        if ($ip >= 2886729728 && $ip <= 2887778303) return false;
        if ($ip >= 3221225984 && $ip <= 3221226239) return false;
        if ($ip >= 3232235520 && $ip <= 3232301055) return false;
        if ($ip >= 4294967040) return false;
    }
    return true;
}

来源:http://blackbe.lt/advanced-method-to-obtain-the-client-ip-in-php/[62]

其它参考8

答案是使用$_SERVER变量。例如，$_SERVER["REMOTE_ADDR"]将返回客户端的IP地址。[63]

其它参考9

这是我使用的方法，它验证IPv4输入:[64]

// Get user IP address
if ( isset($_SERVER['HTTP_CLIENT_IP']) && ! empty($_SERVER['HTTP_CLIENT_IP'])) {
    $ip = $_SERVER['HTTP_CLIENT_IP'];
} elseif ( isset($_SERVER['HTTP_X_FORWARDED_FOR']) && ! empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
    $ip = (isset($_SERVER['REMOTE_ADDR'])) ? $_SERVER['REMOTE_ADDR'] : '0.0.0.0';
}

$ip = filter_var($ip, FILTER_VALIDATE_IP);
$ip = ($ip === false) ? '0.0.0.0' : $ip;

其它参考10

$ip = "";

if (!empty($_SERVER["HTTP_CLIENT_IP"]))
{
 //check for ip from share internet
 $ip = $_SERVER["HTTP_CLIENT_IP"];
}
elseif (!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))
{
 // Check for the Proxy User
 $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
}
else
{
 $ip = $_SERVER["REMOTE_ADDR"];
}
echo $ip;

其它参考11

我喜欢这个codesnippet:

function getClientIP() {

    if (isset($_SERVER)) {

        if (isset($_SERVER["HTTP_X_FORWARDED_FOR"]))
            return $_SERVER["HTTP_X_FORWARDED_FOR"];

        if (isset($_SERVER["HTTP_CLIENT_IP"]))
            return $_SERVER["HTTP_CLIENT_IP"];

        return $_SERVER["REMOTE_ADDR"];
    }

    if (getenv('HTTP_X_FORWARDED_FOR'))
        return getenv('HTTP_X_FORWARDED_FOR');

    if (getenv('HTTP_CLIENT_IP'))
        return getenv('HTTP_CLIENT_IP');

    return getenv('REMOTE_ADDR');
}

其它参考12

 $_SERVER['REMOTE_ADDR'];

试试这个

其它参考13

好吧，这可以通过使用名为$_SERVER的GLOBAL变量来完成。


$_SERVER是一个具有属性名REMOTE_ADDR的数组。


只需像这样分配它
$userIp = $_SERVER['REMOTE_ADDR'];


或像echo $_SERVER['REMOTE_ADDR'];一样直接使用
或echo ($_SERVER['REMOTE_ADDR']);

其它参考14

正如所有其他人所说，您可以使用$_SERVER['REMOTE_ADDR'];获取客户​​端IP地址。


此外，如果您需要有关用户的更多信息，可以使用以下命令:

<?php
    $ip='0.0.0.0';
    $ip=$_SERVER['REMOTE_ADDR'];
    $clientDetails = json_decode(file_get_contents("http://ipinfo.io/$ip/json"));
    echo "You're logged in from: <b>" . $clientDetails->country . "</b>";
?>

客户端更具体的信息在$ clientDetails中。

您可以通过以下方式获取存储在$ clientDetails变量中的json项:$ clientDetails-> PostalCode/hostname/region/loc ...


我正在使用ipinfo.io获取额外信息。[65]


我希望它有所帮助。

其它参考15

以下函数确定所有可能性并以逗号分隔(ip，ip等)返回值。


它还具有可选的验证功能(默认情况下禁用的第一个参数)以验证IP地址(私有范围和保留范围)。

<?php
echo GetClientIP(true);

function GetClientIP($validate = False){
  $ipkeys = array(
  'REMOTE_ADDR', 
  'HTTP_CLIENT_IP', 
  'HTTP_X_FORWARDED_FOR', 
  'HTTP_X_FORWARDED', 
  'HTTP_FORWARDED_FOR', 
  'HTTP_FORWARDED', 
  'HTTP_X_CLUSTER_CLIENT_IP'
  );

  /*
  now we check each key against $_SERVER if contain such value
  */
  $ip = array();
  foreach($ipkeys as $keyword){
    if( isset($_SERVER[$keyword]) ){
      if($validate){
        if( ValidatePublicIP($_SERVER[$keyword]) ){
          $ip[] = $_SERVER[$keyword];
        }
      }else{
        $ip[] = $_SERVER[$keyword];
      }
    }
  }

  $ip = ( empty($ip) ? 'Unknown' : implode(", ", $ip) );
  return $ip;

}
function ValidatePublicIP($ip){
  if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
    return true;
  }
  else {
    return false;
  }
} 

其它参考16

此功能紧凑，您可以在任何地方使用它。但是!


不要忘记这一点!在这种类型的功能或代码块不保证记录用户真实IP，因为一些用户可以使用代理或其他安全网关是隐形或无法跟踪


Php功能:

function GetIP()
{
    if ( getenv("HTTP_CLIENT_IP") ) {
        $ip = getenv("HTTP_CLIENT_IP");
    } elseif ( getenv("HTTP_X_FORWARDED_FOR") ) {
        $ip = getenv("HTTP_X_FORWARDED_FOR");
        if ( strstr($ip, ',') ) {
            $tmp = explode(',', $ip);
            $ip = trim($tmp[0]);
        }
    } else {
        $ip = getenv("REMOTE_ADDR");
    }
    return $ip;
}

用法:


$IP = GetIP();或直接GetIP();

其它参考17

function get_client_ip() 
{
   $ipaddress = '';
    if (getenv('HTTP_CLIENT_IP'))
        $ipaddress = getenv('HTTP_CLIENT_IP');
    else if(getenv('HTTP_X_FORWARDED_FOR'))
        $ipaddress = getenv('HTTP_X_FORWARDED_FOR');
    else if(getenv('HTTP_X_FORWARDED'))
        $ipaddress = getenv('HTTP_X_FORWARDED');
    else if(getenv('HTTP_FORWARDED_FOR'))
        $ipaddress = getenv('HTTP_FORWARDED_FOR');
    else if(getenv('HTTP_FORWARDED'))
       $ipaddress = getenv('HTTP_FORWARDED');
    else if(getenv('REMOTE_ADDR'))
        $ipaddress = getenv('REMOTE_ADDR');
    else
        $ipaddress = 'UNKNOWN';

   return $ipaddress;
} 

其它参考18

像那样????

if(($ip=filter_input(INPUT_SERVER,'REMOTE_ADDR',validate_ip))===false or empty($ip)){
  exit;
  }
echo $ip;

---

PS

if(($ip=filter_input(INPUT_SERVER,'REMOTE_ADDR',FILTER_VALIDATE_IP|FILTER_FLAG_NO_PRIV_RANGE|FILTER_FLAG_NO_RES_RANGE))===false){
  header('HTTP/1.0 400 Bad Request');
  exit;
}

以HTTP_或X-开头的所有标题可以分别是用户定义的欺骗。如果你想跟踪使用cooies等

其它参考19

这是一个简单的单线

$ip = $_SERVER['HTTP_X_FORWARDED_FOR']?: $_SERVER['HTTP_CLIENT_IP']?: $_SERVER['REMOTE_ADDR'];

编辑:


上面的代码可能会返回保留地址(如10.0.0.1)，路上所有代理服务器的地址列表等。
要处理这些情况，请使用以下代码:[66] [67]

function valid_ip($ip) {
    // for list of reserved IP addresses, see https://en.wikipedia.org/wiki/Reserved_IP_addresses
    return $ip && substr($ip, 0, 4) != '127.' && substr($ip, 0, 4) != '127.' && substr($ip, 0, 3) != '10.' && substr($ip, 0, 2) != '0.' ? $ip : false;
}

function get_client_ip() {
    // using explode to get only client ip from list of forwarders. see https://en.wikipedia.org/wiki/X-Forwarded-For
    return
    @$_SERVER['HTTP_X_FORWARDED_FOR'] ? explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'], 2)[0] :
    @$_SERVER['HTTP_CLIENT_IP'] ? explode(',', $_SERVER['HTTP_CLIENT_IP'], 2)[0] :
    valid_ip(@$_SERVER['REMOTE_ADDR']) ?:
    'UNKNOWN';
}

echo get_client_ip();

其它参考20

$_SERVER['REMOTE_ADDR'];

例:

if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
    $ip = $_SERVER['HTTP_CLIENT_IP'];
} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
    $ip = $_SERVER['REMOTE_ADDR'];
}

其它参考21

这是获取客户端IP地址的单行版本:

  $ip = @$_SERVER['HTTP_CLIENT_IP'] ?: @$_SERVER['HTTP_X_FORWARDED_FOR'] ?: @$_SERVER['REMOTE_ADDR'];

笔记:

• 通过使用@，它会禁止PHP通知。


• 来自HTTP_X_FORWARDED_FOR的值可能包含以逗号分隔的多个地址，因此如果您希望获得第一个地址，则可以使用以下方法:
  
  
  

  current(explode(',', @$_SERVER['HTTP_X_FORWARDED_FOR']))