IP.class.php
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<?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
*/
namespace Com\IP;
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);
}
}
}
?>