php获取客户端ip地址方法

 1 /**
 2      * 获取客户端IP地址
 3      * @param integer   $type 返回类型 0 返回IP地址 1 返回IPV4地址数字
 4      * @param boolean   $adv 是否进行高级模式获取（有可能被伪装）
 5      * @return mixed
 6      */
 7     public function ip($type = 0, $adv = true)
 8     {
 9         $type      = $type ? 1 : 0;
10         static $ip = null;
11         if (null !== $ip) {
12             return $ip[$type];
13         }
14 
15         $httpAgentIp = Config::get('http_agent_ip');
16 
17         if ($httpAgentIp && isset($_SERVER[$httpAgentIp])) {
18             $ip = $_SERVER[$httpAgentIp];
19         } elseif ($adv) {
20             if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
21                 $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
22                 $pos = array_search('unknown', $arr);
23                 if (false !== $pos) {
24                     unset($arr[$pos]);
25                 }
26                 $ip = trim(current($arr));
27             } elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
28                 $ip = $_SERVER['HTTP_CLIENT_IP'];
29             } elseif (isset($_SERVER['REMOTE_ADDR'])) {
30                 $ip = $_SERVER['REMOTE_ADDR'];
31             }
32         } elseif (isset($_SERVER['REMOTE_ADDR'])) {
33             $ip = $_SERVER['REMOTE_ADDR'];
34         }
35         // IP地址合法验证
36         $long = sprintf("%u", ip2long($ip));
37         $ip   = $long ? [$ip, $long] : ['0.0.0.0', 0];
38         return $ip[$type];
39     }