PHP获取IP的多种方式解析

 转自：http://developer.51cto.com/art/200911/164514.htm

PHP获取IP的方法有许多种，我们今天向大家总结了六种方法，希望通过对这六种方法的学习，能够加深我们对PHP语言的进一步了解，巩固我们所掌握的知识。

PHP获取IP方法一：

<?php 
echo "<br>";  
?> <?php function GetIP()  
{  
if(!empty($_SERVER["HTTP_CLIENT_IP"]))  $cip = $_SERVER["HTTP_CLIENT_IP"];  
else if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))  $cip = $_SERVER["HTTP_X_FORWARDED_FOR"];  
else if(!empty($_SERVER["REMOTE_ADDR"]))  $cip = $_SERVER["REMOTE_ADDR"];  
else  $cip = "无法获取！";  
return $cip;  
}  
echo "<br>";  
?> 

PHP获取IP方法二：

<?php 
echo "<br>";  
?> <? 
error_reporting (E_ERROR | E_WARNING | E_PARSE);  
if($HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"])   
{                                                $ip = $HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"];  }                                                
elseif($HTTP_SERVER_VARS["HTTP_CLIENT_IP"])      
{                                                $ip = $HTTP_SERVER_VARS["HTTP_CLIENT_IP"];  }                                                
elseif ($HTTP_SERVER_VARS["REMOTE_ADDR"])         
{                                                $ip = $HTTP_SERVER_VARS["REMOTE_ADDR"];    }                                                
elseif (getenv("HTTP_X_FORWARDED_FOR"))            
{                                                $ip = getenv("HTTP_X_FORWARDED_FOR");    }                                                
elseif (getenv("HTTP_CLIENT_IP"))                  
{                                                $ip = getenv("HTTP_CLIENT_IP");    }            elseif (getenv("REMOTE_ADDR"))                     
{                                                $ip = getenv("REMOTE_ADDR");   }         else                                             
{                                                $ip = "Unknown";      }                                                
echo "你的IP地址是:".$ip."<br>";                              
?>   

PHP获取IP方法三：

<?php 
echo "<br>";  
?> <? 
$iipp = $_SERVER["REMOTE_ADDR"];  
echo $iipp;  
echo "<br>";  
?> 

PHP获取IP方法四：

<?php 
echo "<br>";  
?> <?php 
$user_IP = ($_SERVER["HTTP_VIA"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : $_SERVER["REMOTE_ADDR"];  
$user_IP = ($user_IP) ? $user_IP : $_SERVER["REMOTE_ADDR"];  
echo $user_IP."<br>";  
?> 

PHP获取IP方法五：

<?php 
echo "<br>";  
?> <? 
function get_real_ip()  
{  $ip=false;  if(!empty($_SERVER["HTTP_CLIENT_IP"]))  {  $ip = $_SERVER["HTTP_CLIENT_IP"];  }  if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))  {  $ips = explode (", ", $_SERVER['HTTP_X_FORWARDED_FOR']);  if ($ip)  {  array_unshift($ips, $ip); $ip = FALSE;  }  for ($i = 0; $i < count($ips); $i++)  {  if (!eregi ("^(10|172\.16|192\.168)\.", $ips[$i]))  {  $ip = $ips[$i];  break;  }  }  }  return ($ip ? $ip : $_SERVER['REMOTE_ADDR']);  
}  
echo get_real_ip();  
echo "<br>";  
?> 

PHP获取IP方法六：

<?php 
echo "<br>";  
?> <? 
if(getenv('HTTP_CLIENT_IP'))  
{  $onlineip = getenv('HTTP_CLIENT_IP');  
}  
elseif(getenv('HTTP_X_FORWARDED_FOR'))  
{  $onlineip = getenv('HTTP_X_FORWARDED_FOR');  
}  
elseif(getenv('REMOTE_ADDR'))  
{  $onlineip = getenv('REMOTE_ADDR');  
}  
else  
{  $onlineip = $HTTP_SERVER_VARS['REMOTE_ADDR'];  
}  
echo $onlineip;  
echo "<br>";  
?>