add geo ip

ip/IP.class.php

@@ -0,0 +1,109 @@
+<?php
+
+/*
+    全球 IPv4 地址归属地数据库(17MON.CN 版)
+    高春辉(pAUL gAO) <gaochunhui@gmail.com>
+    Build 20141009 版权所有 17MON.CN
+    (C) 2006 - 2014 保留所有权利
+    请注意及时更新 IP 数据库版本
+    数据问题请加 QQ 群: 346280296
+    Code for PHP 5.3+ only
+*/
+
+class IP
+{
+    private static $ip     = NULL;
+
+    private static $fp     = NULL;
+    private static $offset = NULL;
+    private static $index  = NULL;
+
+    private static $cached = array();
+
+    public static function find($ip)
+    {
+        if (empty($ip) === TRUE)
+        {
+            return 'N/A';
+        }
+
+        $nip   = gethostbyname($ip);
+        $ipdot = explode('.', $nip);
+
+        if ($ipdot[0] < 0 || $ipdot[0] > 255 || count($ipdot) !== 4)
+        {
+            return 'N/A';
+        }
+
+        if (isset(self::$cached[$nip]) === TRUE)
+        {
+            return self::$cached[$nip];
+        }
+
+        if (self::$fp === NULL)
+        {
+            self::init();
+        }
+
+        $nip2 = pack('N', ip2long($nip));
+
+        $tmp_offset = (int)$ipdot[0] * 4;
+        $start      = unpack('Vlen', self::$index[$tmp_offset] . self::$index[$tmp_offset + 1] . self::$index[$tmp_offset + 2] . self::$index[$tmp_offset + 3]);
+
+        $index_offset = $index_length = NULL;
+        $max_comp_len = self::$offset['len'] - 1024 - 4;
+        for ($start = $start['len'] * 8 + 1024; $start < $max_comp_len; $start += 8)
+        {
+            if (self::$index{$start} . self::$index{$start + 1} . self::$index{$start + 2} . self::$index{$start + 3} >= $nip2)
+            {
+                $index_offset = unpack('Vlen', self::$index{$start + 4} . self::$index{$start + 5} . self::$index{$start + 6} . "\x0");
+                $index_length = unpack('Clen', self::$index{$start + 7});
+
+                break;
+            }
+        }
+
+        if ($index_offset === NULL)
+        {
+            return 'N/A';
+        }
+
+        fseek(self::$fp, self::$offset['len'] + $index_offset['len'] - 1024);
+
+        self::$cached[$nip] = explode("\t", fread(self::$fp, $index_length['len']));
+
+        return self::$cached[$nip];
+    }
+
+    private static function init()
+    {
+        if (self::$fp === NULL)
+        {
+            self::$ip = new self();
+
+            self::$fp = fopen(__DIR__ . '/17monipdb.dat', 'rb');
+            if (self::$fp === FALSE)
+            {
+                throw new Exception('Invalid 17monipdb.dat file!');
+            }
+
+            self::$offset = unpack('Nlen', fread(self::$fp, 4));
+            if (self::$offset['len'] < 4)
+            {
+                throw new Exception('Invalid 17monipdb.dat file!');
+            }
+
+            self::$index = fread(self::$fp, self::$offset['len'] - 4);
+        }
+    }
+
+    public function __destruct()
+    {
+        if (self::$fp !== NULL)
+        {
+            fclose(self::$fp);
+        }
+    }
+}
+
+?>