get_client_ip() 获取IP地址

get_client_ip()获取ip地址，在开启IPv6协议的主机上会全部返回0.0.0.0原因是他会把ipv6地址认为是非法地址而转换成0.0.0.0，而ipv4地址在ipv6主机上用get_client_ip()会放回类似::ffff:192.168.1.250这样的形式。

 1 /**
 2 * 转换IPv6地址为bin
 3 * @param string $ip 返回类型 0 数字 1 返回False
 4 * @return mixed
 5 */
 6 function ip2bin($ip) 
 7 { 
 8 if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== false) 
 9 return base_convert(ip2long($ip),10,2); 
10 if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) === false) 
11 return false; 
12 if(($ip_n = inet_pton($ip)) === false) return false; 
13 $bits = 15; // 16 x 8 bit = 128bit (ipv6) 
14 while ($bits >= 0) 
15 { 
16 $bin = sprintf("%08b",(ord($ip_n[$bits]))); 
17 $ipbin = $bin.$ipbin; 
18 $bits--; 
19 } 
20 return $ipbin; 
21 } 
22 /**
23 * 转换bin地址为IPv6 或IPv4
24 * @param long $bin 返回类型 0 IPv4 IPv6地址
25 * @return mixed
26 */
27 function bin2ip($bin) 
28 { 
29 if(strlen($bin) <= 32) // 32bits (ipv4) 
30 return long2ip(base_convert($bin,2,10)); 
31 if(strlen($bin) != 128) 
32 return false; 
33 $pad = 128 - strlen($bin); 
34 for ($i = 1; $i <= $pad; $i++) 
35 { 
36 $bin = "0".$bin; 
37 } 
38 $bits = 0; 
39 while ($bits <= 7) 
40 { 
41 $bin_part = substr($bin,($bits*16),16); 
42 $ipv6 .= dechex(bindec($bin_part)).":"; 
43 $bits++; 
44 } 
45 return inet_ntop(inet_pton(substr($ipv6,0,-1))); 
46 } 
47 /**
48 * 获取客户端IP地址
49 * @param integer $type 返回类型 0 返回IP地址 1 返回IPV4地址数字
50 * @return mixed
51 */
52 function get_client_ip6($type = 0) {
53 $type = $type ? 1 : 0;
54 static $ip = NULL;
55 if ($ip !== NULL) return $ip[$type];
56 if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
57 $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
58 $pos = array_search('unknown',$arr);
59 if(false !== $pos) unset($arr[$pos]);
60 $ip = trim($arr[0]);
61 }elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
62 $ip = $_SERVER['HTTP_CLIENT_IP'];
63 }elseif (isset($_SERVER['REMOTE_ADDR'])) {
64 $ip = $_SERVER['REMOTE_ADDR'];
65 }
66 // IP地址合法验证
67 $long = sprintf("%u",ip2bin($ip));
68 $ip = $long ? array($ip, $long) : array('0.0.0.0', 0);
69 return $ip[$type];
70 }