1. <?php  
2. class IpLocation {  
3.      
4.  
5.   
6.     private $fp;  
7.   
8.      
9.  
10.  
11.   
12.     private $firstip;  
13.   
14.      
15.  
16.  
17.   
18.     private $lastip;  
19.   
20.      
21.  
22.  
23.   
24.     private $totalip;  
25.   
26.      
27.  
28.  
29.  
30.   
31.     public function __construct($filename = "qqwry.dat") {  
32.         $this->fp = 0;  
33.         if (($this->fp = @fopen($filename, 'rb')) !== false) {  
34.             $this->firstip = $this->getlong();  
35.             $this->lastip = $this->getlong();  
36.             $this->totalip = ($this->lastip - $this->firstip) / 7;  
37.         }  
38.     }  
39.   
40.      
41.  
42.  
43.  
44.   
45.     public function getlong() {  
46.           
47.         $result = unpack('Vlong', fread($this->fp, 4));  
48.         return $result['long'];  
49.     }  
50.   
51.      
52.  
53.  
54.  
55.  
56.   
57.     public function getlong3() {  
58.           
59.         $result = unpack('Vlong', fread($this->fp, 3).chr(0));  
60.         return $result['long'];  
61.     }  
62.   
63.      
64.  
65.  
66.  
67.  
68.  
69.   
70.     public function packip($ip) {  
71.           
72.           
73.         return pack('N', intval(ip2long($ip)));  
74.     }  
75.   
76.      
77.  
78.  
79.  
80.  
81.  
82.   
83.     public function getstring($data = "") {  
84.         $char = fread($this->fp, 1);  
85.         while (ord($char) > 0) {   
86.             $data .= $char;   
87.             $char = fread($this->fp, 1);  
88.         }  
89.         return mb_convert_encoding($data, 'utf-8', 'gb2312');  
90.     }  
91.   
92.      
93.  
94.  
95.  
96.  
97.   
98.     public function getarea() {  
99.         $byte = fread($this->fp, 1);   
100.         switch (ord($byte)) {  
101.             case 0:   
102.                 $area = "";  
103.             break;  
104.             case 1:  
105.             case 2:   
106.                 fseek($this->fp, $this->getlong3());  
107.                 $area = $this->getstring();  
108.             break;  
109.             default:   
110.                 $area = $this->getstring($byte);  
111.             break;  
112.         }  
113.         return $area;  
114.     }  
115.   
116.      
117.  
118.  
119.  
120.  
121.   
122.     function getlocation($ip) {  
123.         if (!$this->fp) return null;   
124.         $location['ip'] = gethostbyname($ip);   
125.         $ip = $this->packip($location['ip']);   
126.           
127.           
128.         $l = 0;   
129.         $u = $this->totalip;   
130.         $findip = $this->lastip;   
131.         while ($l <= $u) {   
132.             $i = floor(($l + $u) / 2);   
133.             fseek($this->fp, $this->firstip + $i * 7);  
134.             $beginip = strrev(fread($this->fp, 4));   
135.               
136.               
137.             if ($ip < $beginip) {   
138.                 $u = $i - 1;   
139.             }else{  
140.                 fseek($this->fp, $this->getlong3());  
141.                 $endip = strrev(fread($this->fp, 4));   
142.                 if ($ip > $endip) {   
143.                     $l = $i + 1;   
144.                 }else{   
145.                     $findip = $this->firstip + $i * 7;  
146.                     break;   
147.                 }  
148.             }  
149.         }  
150.   
151.           
152.         fseek($this->fp, $findip);  
153.         $location['beginip'] = long2ip($this->getlong());   
154.         $offset = $this->getlong3();  
155.         fseek($this->fp, $offset);  
156.         $location['endip'] = long2ip($this->getlong());   
157.         $byte = fread($this->fp, 1);   
158.   
159.         switch (ord($byte)) {  
160.             case 1:   
161.                 $countryOffset = $this->getlong3();   
162.                 fseek($this->fp, $countryOffset);  
163.                 $byte = fread($this->fp, 1);   
164.                 switch (ord($byte)) {  
165.                     case 2:   
166.                         fseek($this->fp, $this->getlong3());  
167.                         $location['country'] = $this->getstring();  
168.                         fseek($this->fp, $countryOffset + 4);  
169.                         $location['area'] = $this->getarea();  
170.                         break;  
171.                     default:   
172.                         $location['country'] = $this->getstring($byte);  
173.                         $location['area'] = $this->getarea();  
174.                         break;  
175.                 }  
176.                 break;  
177.             case 2:   
178.                 fseek($this->fp, $this->getlong3());  
179.                 $location['country'] = $this->getstring();  
180.                 fseek($this->fp, $offset + 8);  
181.                 $location['area'] = $this->getarea();  
182.                 break;  
183.             default:   
184.                 $location['country'] = $this->getstring($byte);  
185.                 $location['area'] = $this->getarea();  
186.                 break;  
187.         }  
188.         if ($location['country'] == " CZ88.NET") {   
189.             $location['country'] = "未知";  
190.         }  
191.         if ($location['area'] == " CZ88.NET") {  
192.             $location['area'] = "";  
193.         }  
194.         return $location;  
195.     }  
196.   
197.       
198.      
199.  
200.  
201.   
202.     function __desctruct() {  
203.         if ($this->fp) {  
204.             fclose($this->fp);  
205.         }  
206.         $this->fp = 0;  
207.     }  
208. }  
209. ?>   

1. <?php   
2. function getIpPlace(){  
3.     require_once("IpLocation.php")  
4.     $ipfile = "qqwry.dat";        
5.     $iplocation = new IpLocation($ipfile);    
6.     $ipresult = $iplocation->getlocation("ip地址");   
7.     return $ipresult;  
8. }  
9. print_r($getIpPlace());   
10. ?> 
    

http://blog.csdn.net/motian06/article/details/7919675