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<?php namespace Zhuzhichao\IpLocationZh; |
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use Exception; |
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class IP |
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{ |
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private static $ip = null; |
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private static $fp = null; |
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private static $offset = null; |
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private static $index = null; |
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private static $cached = array(); |
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public static function find($ip) |
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{ |
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if (empty( $ip ) === true) { |
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return 'N/A'; |
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} |
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$nip = gethostbyname($ip); |
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$ipdot = explode('.', $nip); |
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if ($ipdot[0] < 0 || $ipdot[0] > 255 || count($ipdot) !== 4) { |
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return 'N/A'; |
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} |
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if (isset( self::$cached[$nip] ) === true) { |
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return self::$cached[$nip]; |
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} |
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if (self::$fp === null) { |
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self::init(); |
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} |
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$nip2 = pack('N', ip2long($nip)); |
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$tmp_offset = (int) $ipdot[0] * 4; |
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$start = unpack('Vlen', |
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self::$index[$tmp_offset].self::$index[$tmp_offset + 1].self::$index[$tmp_offset + 2].self::$index[$tmp_offset + 3]); |
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$index_offset = $index_length = null; |
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$max_comp_len = self::$offset['len'] - 1024 - 4; |
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for ($start = $start['len'] * 8 + 1024; $start < $max_comp_len; $start += 8) { |
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if (self::$index{$start}.self::$index{$start + 1}.self::$index{$start + 2}.self::$index{$start + 3} >= $nip2) { |
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$index_offset = unpack('Vlen', |
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self::$index{$start + 4}.self::$index{$start + 5}.self::$index{$start + 6}."\x0"); |
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$index_length = unpack('Clen', self::$index{$start + 7}); |
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break; |
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} |
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} |
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if ($index_offset === null) { |
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return 'N/A'; |
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} |
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fseek(self::$fp, self::$offset['len'] + $index_offset['len'] - 1024); |
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self::$cached[$nip] = explode("\t", fread(self::$fp, $index_length['len'])); |
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return self::$cached[$nip]; |
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} |
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private static function init() |
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{ |
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if (self::$fp === null) { |
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self::$ip = new self(); |
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self::$fp = fopen(__DIR__.'/17monipdb.dat', 'rb'); |
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if (self::$fp === false) { |
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throw new Exception('Invalid 17monipdb.dat file!'); |
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} |
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self::$offset = unpack('Nlen', fread(self::$fp, 4)); |
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if (self::$offset['len'] < 4) { |
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throw new Exception('Invalid 17monipdb.dat file!'); |
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} |
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self::$index = fread(self::$fp, self::$offset['len'] - 4); |
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} |
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} |
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public function __destruct() |
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{ |
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if (self::$fp !== null) { |
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fclose(self::$fp); |
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} |
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} |
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} |
zhuzhichao /
ip-location-zh
