php获取客户端IP地址的几种方法

PHP Code one:
<?
//php获取ip的算法
$iipp=$_SERVER["REMOTE_ADDR"];
echo $iipp;
?> 


PHP Code two:
<?php
//php获取ip的算法
$user_IP = ($_SERVER["HTTP_VIA"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : $_SERVER["REMOTE_ADDR"];
$user_IP = ($user_IP) ? $user_IP : $_SERVER["REMOTE_ADDR"]; 

echo $user_IP;
?>

///////////////////////////////////////////////

<?
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();
?> 


PHP Code three:
<? 
//php获取ip的算法
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 
{ 
$ip = "Unknown"; 
} 
echo "你的IP:".$ip ; 
?>  


PHP Code four:
<?
//php获取ip的算法
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;
?>