纯真IP库PHP查询

我就是我 2022-08-20 03:29 213阅读 0赞

class IP{
    
    	private $fh;       // IP数据库文件句柄
    	private $first;    // 第一条索引
    	private $last;     // 最后一条索引
    	private $total;    // 索引总数
    
    	public function __construct(){
    		$this->fh = fopen('qqwry.dat', 'rb');            // 读取数据文件
    		$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的合法性 */
    	public function checkIP($ip){
    		$ipArr = explode('.',$ip);
    		if(count($ipArr) < 4) return false;
    		foreach ($ipArr as $key => $value) {
    			if($value < 0 || $value > 255){
    				return false;
    			}
    		}
    		return true;
    	}
    
    	/* 读取little-endian编码的4个字节转化为长整型数 */
    	public function getLong4() {
    		$result = unpack('Vlong', fread($this->fh, 4));
    		return $result['long'];
    	}
    
    	/* 读取little-endian编码的3个字节转化为长整型数 */
    	public function getLong3() {
    		$result = unpack('Vlong', fread($this->fh, 3).chr(0));
    		return $result['long'];
    	}
    
    	/* 获取位置信息 */
    	public 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;
    	}
    
    	/* 获取所属地区 */
    	public 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;
    	}
    
    	/* 获取地址 */
    	public 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 <= $r) {
    			$m = floor(($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 < $beginip){ //用户的IP小于中间索引的开始IP地址时
    				$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);
    	}
    
    }
    
    
    
    /* 调用实例 */
    $ip = new ip();
    $addr = $ip -> ip2addr('117.136.30.178');
    print_r($addr);