Question

如何使用PHP获取客户端IP地址？

我想记录通过他/她的IP地址登录我网站的用户。

Answer 1

无论您做什么，请确保不要信任从客户端发送的数据。 $_SERVER['REMOTE_ADDR']包含连接方的真实IP地址。这是您可以找到的最可靠的价值。

但是，它们可能位于代理服务器后面，在这种情况下代理可能已设置$_SERVER['HTTP_X_FORWARDED_FOR']，但此值很容易被欺骗。例如，它可以由没有代理的人设置，或者IP可以是来自代理后面的LAN的内部IP。

这意味着如果您要保存$_SERVER['HTTP_X_FORWARDED_FOR']，请确保还保存$_SERVER['REMOTE_ADDR']值。例如。将这两个值保存在数据库的不同字段中。

如果要以字符串形式将IP保存到数据库，请确保至少有 45个字符的空间。 IPv6将保留，并且这些地址大于旧的IPv4地址。

（请注意，IPv6通常最多使用39个字符，但也有一个特殊的IPv6 notation for IPv4 addresses，其完整形式最多可包含45个字符。因此，如果您知道自己在做什么，则可以使用39个字符，但如果您只想设置并忘记它，请使用45）。

Answer 2

$_SERVER['REMOTE_ADDR']实际上可能不包含真实的客户端IP地址，因为它会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的影响。如果您说，尝试查看您的流量源自哪里，或者记住用户上次连接的IP，代理或NAT网关的公共IP可能更多，那么某人的私有RFC1918地址可能对您没有任何帮助。适合存放。

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。他们的内容无法保证。 $_SERVER['REMOTE_ADDR']是Web服务器从其接收连接并将响应发送到的实际物理IP地址。其他任何事情都只是随意和自愿的信息。只有一种情况可以信任此信息：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有意义，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：使用上述代码有安全隐患。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，因为用户无法设置此项。

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

Answer 3

echo $_SERVER['REMOTE_ADDR'];

http://php.net/manual/en/reserved.variables.server.php

Answer 4

以下是获取用户IP地址的好方法的清洁代码示例。

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

以下是使用elvis运算符的较短版本：

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

这是一个使用isset删除通知的版本（谢谢你，@ 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'];

Answer 5

它应该包含在$_SERVER['REMOTE_ADDR']变量中。

Answer 6

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受信任的代理，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

Answer 7

互联网背后有不同类型的用户，因此我们希望从不同的部分捕获IP地址。那些是：

<强> 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。

<强> 2。 $_SERVER['REMOTE_HOST'] - 这将获取用户正在查看当前页面的主机名。但是要使此脚本生效，必须配置httpd.conf内部的主机名查找。

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

<强> 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正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;
}

Answer 8

以下是我发现的最先进的方法，过去我已经尝试了其他一些方法。确保获取访问者的IP地址是有效的（但请注意，任何黑客都可以轻易伪造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 IP addresses passing through proxies
    if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {

        // Check if multiple IP addresses 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 address since all else failed
    return $_SERVER['REMOTE_ADDR'];
}

/**
 * Ensures an IP address is both a valid IP address 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 address is set and not equivalent to 255.255.255.255
    if ($ip !== false && $ip !== -1) {
        // Make sure to get unsigned long representation of IP address
        // 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;
}

Answer 9

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

Answer 10

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：

<?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-＆gt; PostalCode / hostname / region / loc ...

我正在使用ipinfo.io来获取额外信息。

Answer 11

这是我使用的方法，它验证了IPv4输入：

// 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;

Answer 12

$ip = "";

if (!empty($_SERVER["HTTP_CLIENT_IP"]))
{
    // Check for IP address from shared 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;

Answer 13

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');
}

Answer 14

试试这个：

 $_SERVER['REMOTE_ADDR'];

Answer 15

嗯，这可以通过使用名为GLOBAL的{{1}}变量来完成。

$_SERVER是一个具有属性名称$_SERVER的数组。

只需像这样分配：

REMOTE_ADDR

或直接使用$userIp = $_SERVER['REMOTE_ADDR']; 或echo $_SERVER['REMOTE_ADDR'];。

Answer 16

以下函数确定所有可能性并以逗号分隔格式（ip，ip等）返回值。

它还有一个可选的验证功能（默认情况下禁用的第一个参数），用于验证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 containing 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;
  }
}

Answer 17

此功能紧凑，您可以随处使用。但是！

别忘了这个！在这种类型的功能或代码块中，不能保证记录用户的真实IP地址，因为某些用户可以使用代理或其他安全网关来隐藏或无法跟踪

PHP函数：

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();

Answer 18

用于获取IP地址的安全和警告提示代码段：

$ip = filter_input(INPUT_SERVER, 'HTTP_CLIENT_IP', FILTER_VALIDATE_IP)
    ?: filter_input(INPUT_SERVER, 'HTTP_X_FORWARDED_FOR', FILTER_VALIDATE_IP)
    ?: $_SERVER['REMOTE_ADDR']
    ?? '0.0.0.0'; // Or other value fits "not defined" in your logic

Answer 19

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;
}

Answer 20

以下是获取客户端IP地址的单行版本：

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

注意：

使用@，它会禁止PHP通知。
来自HTTP_X_FORWARDED_FOR的值可能包含多个以逗号分隔的地址，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']))
```

Answer 21

此功能应该可以正常工作

function Get_User_Ip()
{
    $IP = false;
    if (getenv('HTTP_CLIENT_IP'))
    {
        $IP = getenv('HTTP_CLIENT_IP');
    }
    else if(getenv('HTTP_X_FORWARDED_FOR'))
    {
        $IP = getenv('HTTP_X_FORWARDED_FOR');
    }
    else if(getenv('HTTP_X_FORWARDED'))
    {
        $IP = getenv('HTTP_X_FORWARDED');
    }
    else if(getenv('HTTP_FORWARDED_FOR'))
    {
        $IP = getenv('HTTP_FORWARDED_FOR');
    }
    else if(getenv('HTTP_FORWARDED'))
    {
        $IP = getenv('HTTP_FORWARDED');
    }
    else if(getenv('REMOTE_ADDR'))
    {
        $IP = getenv('REMOTE_ADDR');
    }

    //If HTTP_X_FORWARDED_FOR == server ip
    if((($IP) && ($IP == getenv('SERVER_ADDR')) && (getenv('REMOTE_ADDR')) || (!filter_var($IP, FILTER_VALIDATE_IP))))
    {
        $IP = getenv('REMOTE_ADDR');
    }

    if($IP)
    {
        if(!filter_var($IP, FILTER_VALIDATE_IP))
        {
            $IP = false;
        }
    }
    else
    {
        $IP = false;
    }
    return $IP;
}

Answer 22

其中之一：

    $ip = $_SERVER['REMOTE_ADDR'];
    $ip = $_SERVER['HTTP_CLIENT_IP'];
    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    $ip = $_SERVER['HTTP_X_FORWARDED'];
    $ip = $_SERVER['HTTP_FORWARDED_FOR'];
    $ip = $_SERVER['HTTP_FORWARDED'];

Answer 23

快速解决方案（无错误）

function getClientIP()
{
    $ipaddress = 'UNKNOWN';
    $keys=array('HTTP_CLIENT_IP','HTTP_X_FORWARDED_FOR','HTTP_X_FORWARDED','HTTP_FORWARDED_FOR','HTTP_FORWARDED','REMOTE_ADDR');
    foreach($keys as $k)
    {
        if (isset($_SERVER[$k]) && !empty($_SERVER[$k]) && filter_var($_SERVER[$k], FILTER_VALIDATE_IP))
        {
            $ipaddress = $_SERVER[$k];
            break;
        }
    }
    return $ipaddress;
}

Answer 24

$_SERVER['REMOTE_ADDR'];

示例：

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'];
}

Answer 25

这是一个简单的单线

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

编辑：

以上代码可能会返回reserved addresses（如10.0.0.1），途中所有代理服务器的list of addresses等。要处理这些情况，请使用以下代码：

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();

Answer 26

喜欢以下内容？

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;
}

所有标题均以＆＃39; HTTP _＆＃39;开头或者＆＃39; X - ＆＃39;可能是欺骗，分别是用户定义的。如果你想跟踪，使用cookies等

Answer 27

// Function to get the client ip address
function get_ip() 
{

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'];
}
return $ip;


}

Answer 28

就此而言，令我惊讶的是尚未得到提及的是，获得位于CloudFlare基础架构之类的那些站点的正确IP地址。它将破坏您的IP地址，并为它们提供相同的值。幸运的是，它们也有一些服务器头。不用我重写已写的内容，而是在这里查找更简洁的答案，是的，我很久以前也经历了此过程。 https://stackoverflow.com/a/14985633/1190051

Answer 29

function get_client_ip()
{
    foreach (array(
                'HTTP_CLIENT_IP',
                'HTTP_X_FORWARDED_FOR',
                'HTTP_X_FORWARDED',
                'HTTP_X_CLUSTER_CLIENT_IP',
                'HTTP_FORWARDED_FOR',
                'HTTP_FORWARDED',
                'REMOTE_ADDR') as $key) {
        if (array_key_exists($key, $_SERVER)) {
            foreach (explode(',', $_SERVER[$key]) as $ip) {
                $ip = trim($ip);
                if ((bool) filter_var($ip, FILTER_VALIDATE_IP,
                                FILTER_FLAG_IPV4 |
                                FILTER_FLAG_NO_PRIV_RANGE |
                                FILTER_FLAG_NO_RES_RANGE)) {
                    return $ip;
                }
            }
        }
    }
    return null;
}

或压缩版本：

function get_ip() {
    foreach (array('HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'REMOTE_ADDR') as $key) {
        if (array_key_exists($key, $_SERVER) === true) {
            foreach (array_map('trim', explode(',', $_SERVER[$key])) as $ip) {
                if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) !== false) {
                    return $ip;
                }
            }
        }
    }
}

Answer 30

这里有一些代码应该通过各种来源选择有效的IP检查。

首先，它检查“ REMOTE_ADDR”是否为公共IP（而不是您的受信任的反向代理之一），然后检查HTTP标头之一，直到找到公共IP并将其返回。（PHP 5.2 +）

只要反向代理受信任或服务器直接与客户端连接，它就应该可靠。

//Get client's IP or null if nothing looks valid
function ip_get($allow_private = false)
{
  //Place your trusted proxy server IPs here.
  $proxy_ip = ['127.0.0.1'];

  //The header to look for (Make sure to pick the one that your trusted reverse proxy is sending or else you can get spoofed)
  $header = 'HTTP_X_FORWARDED_FOR'; //HTTP_CLIENT_IP, HTTP_X_FORWARDED, HTTP_FORWARDED_FOR, HTTP_FORWARDED

  //If 'REMOTE_ADDR' seems to be a valid client IP, use it.
  if(ip_check($_SERVER['REMOTE_ADDR'], $allow_private, $proxy_ip)) return $_SERVER['REMOTE_ADDR'];

  if(isset($_SERVER[$header]))
  {
    //Split comma separated values [1] in the header and traverse the proxy chain backwards.
    //[1] https://en.wikipedia.org/wiki/X-Forwarded-For#Format
    $chain = array_reverse(preg_split('/\s*,\s*/', $_SERVER[$header]));
    foreach($chain as $ip) if(ip_check($ip, $allow_private, $proxy_ip)) return $ip;
  }

   return null;
}

//Check for valid IP. If 'allow_private' flag is set to truthy, it allows private IP ranges as valid client IP as well. (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16)
//Pass your trusted reverse proxy IPs as $proxy_ip to exclude them from being valid.
function ip_check($ip, $allow_private = false, $proxy_ip = [])
{
  if(!is_string($ip) || is_array($proxy_ip) && in_array($ip, $proxy_ip)) return false;
  $filter_flag = FILTER_FLAG_NO_RES_RANGE;

  if(!$allow_private)
  {
    //Disallow loopback IP range which doesn't get filtered via 'FILTER_FLAG_NO_PRIV_RANGE' [1]
    //[1] https://www.php.net/manual/en/filter.filters.validate.php
    if(preg_match('/^127\.$/', $ip)) return false;
    $filter_flag |= FILTER_FLAG_NO_PRIV_RANGE;
  }

  return filter_var($ip, FILTER_VALIDATE_IP, $filter_flag) !== false;
}

Answer 31

要获取客户端 IP 地址，请使用 getenv("REMOTE_ADDR")。

例如

$ip_address = getenv("REMOTE_ADDR");
echo $ip_address;

如果您使用 localhost 调用您的服务器，它将打印出 ::1。因此，请使用直接服务器 IP 地址或域来调用您的服务器。

如何在PHP中获取客户端IP地址

31 个答案: