PHP显示IP的代码

php获取ip的算法 代码1:
<?
$iipp=$_SERVER["REMOTE_ADDR"];
echo $iipp;
?> 

php获取ip的算法 代码2:
<?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;
?>

php获取ip的算法 代码3:
<?
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获取ip的算法 代码4:
<? 
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获取ip的算法 代码5:
<?
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;
?>

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