fh = fopen('qqwry.dat', 'rb'); //qqwry.dat文件 $this->first = $this->getlong4(); $this->last = $this->getlong4(); $this->total = ($this->last - $this->first) / 7; //每条索引7字节 } //检查ip合法性 function checkip($ip) { $arr = explode('.',$ip); if(count($arr) !=4 ) { return false; } else { for ($i=0; $i if ($arr[$i] '255') { return false; } } } return true; } function getlong4() { //读取little-endian编码的4个字节转化为长整型数 $result = unpack('vlong', fread($this->fh, 4)); return $result['long']; } function getlong3() { //读取little-endian编码的3个字节转化为长整型数 $result = unpack('vlong', fread($this->fh, 3).chr(0)); return $result['long']; } //查询信息 function getinfo($data = ) { $char = fread($this->fh, 1); while (ord($char) != 0) { //国家地区信息以0结束 $data .= $char; $char = fread($this->fh, 1); } return $data; } bbs.it-home.org //查询地区信息 function getarea() { $byte = fread($this->fh, 1); //标志字节 switch (ord($byte)) { case 0: $area = ''; break; //没有地区信息 case 1: //地区被重定向 fseek($this->fh, $this->getlong3()); $area = $this->getinfo(); break; case 2: //地区被重定向 fseek($this->fh, $this->getlong3()); $area = $this->getinfo(); break; default: $area = $this->getinfo($byte); break; //地区没有被重定向 } return $area; } function ip2addr($ip) { if(!$this -> checkip($ip)){ return false; } $ip = pack('n', intval(ip2long($ip))); //二分查找 $l = 0; $r = $this->total; while($l $m = floor(($l + $r) / 2); //计算中间索引 fseek($this->fh, $this->first + $m * 7); $beginip = strrev(fread($this->fh, 4)); //中间索引的开始ip地址 fseek($this->fh, $this->getlong3()); $endip = strrev(fread($this->fh, 4)); //中间索引的结束ip地址 if ($ip $r = $m - 1; } else { if ($ip > $endip) { //用户的ip大于中间索引的结束ip地址时 $l = $m + 1; } else { //用户ip在中间索引的ip范围内时 $findip = $this->first + $m * 7; break; } } } //查询国家地区信息 fseek($this->fh, $findip); $location['beginip'] = long2ip($this->getlong4()); //用户ip所在范围的开始地址 $offset = $this->getlong3(); fseek($this->fh, $offset); $location['endip'] = long2ip($this->getlong4()); //用户ip所在范围的结束地址 $byte = fread($this->fh, 1); //标志字节 switch (ord($byte)) { case 1: //国家和区域信息都被重定向 $countryoffset = $this->getlong3(); //重定向地址 fseek($this->fh, $countryoffset); $byte = fread($this->fh, 1); //标志字节 switch (ord($byte)) { case 2: //国家信息被二次重定向 fseek($this->fh, $this->getlong3()); $location['country'] = $this->getinfo(); fseek($this->fh, $countryoffset + 4); $location['area'] = $this->getarea(); break; default: //国家信息没有被二次重定向 $location['country'] = $this->getinfo($byte); $location['area'] = $this->getarea(); break; } break; case 2: //国家信息被重定向 fseek($this->fh, $this->getlong3()); $location['country'] = $this->getinfo(); fseek($this->fh, $offset + 8); $location['area'] = $this->getarea(); break; default: //国家信息没有被重定向 $location['country'] = $this->getinfo($byte); $location['area'] = $this->getarea(); break; } //gb2312 to utf-8（去除无信息时显示的cz88.net） foreach ($location as $k => $v) { $location[$k] = str_replace('cz88.net','',iconv('gb2312', 'utf-8', $v)); } return $location; } //析构函数 function __destruct() { fclose($this->fh); }}$ip = new ip();$addr = $ip -> ip2addr('ip地址');print_r($addr);?>
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