PHP method for determining IP addresses and redirecting to corresponding city substations _ PHP Tutorial

PHP determines the IP address and redirects it to the corresponding City substation. This article mainly introduces how PHP judges and redirects IP addresses to corresponding sub-stations. The example analyzes PHP's URL parsing and redirection skills, a php method for determining IP addresses and redirecting to corresponding city substations

This article mainly introduces how PHP judges IP addresses and redirects them to the corresponding sub-stations in cities. The example analyzes php URL parsing and redirection skills, which has some reference value. For more information, see

This article describes how PHP judges IP addresses and redirects them to the corresponding sub-stations. Share it with you for your reference. The specific implementation method is as follows:

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Class QQWry { Var $ StartIP = 0; Var $ EndIP = 0; Var $ Country = ''; Var $ Local = ''; Var $ CountryFlag = 0; // Identify the Country location // 0x01, followed by a Country offset of 3 bytes without Local // 0x02, followed by the Country offset in 3 bytes, followed by The Local // Others, Country, Local, and Local have similar compression. Multiple references are allowed. Var $ fp; Var $ FirstStartIp = 0; Var $ LastStartIp = 0; Var $ EndIpOff = 0; Function getStartIp ($ RecNo ){ $ Offset = $ this-> FirstStartIp + $ RecNo * 7; @ Fseek ($ this-> fp, $ offset, SEEK_SET ); $ Buf = fread ($ this-> fp, 7 ); $ This-> EndIpOff = ord ($ buf [4]) + (ord ($ buf [5]) * 256) + (ord ($ buf [6]) * 256*256 ); $ This-> StartIp = ord ($ buf [0]) + (ord ($ buf [1]) * 256) + (ord ($ buf [2]) * 256*256) + (ord ($ buf [3]) * 256*256*256 ); Return $ this-> StartIp; } Function getEndIp (){ @ Fseek ($ this-> fp, $ this-> EndIpOff, SEEK_SET ); $ Buf = fread ($ this-> fp, 5 ); $ This-> EndIp = ord ($ buf [0]) + (ord ($ buf [1]) * 256) + (ord ($ buf [2]) * 256*256) + (ord ($ buf [3]) * 256*256*256 ); $ This-> CountryFlag = ord ($ buf [4]); Return $ this-> EndIp; } Function getCountry (){ Switch ($ this-> CountryFlag ){ Case 1: Case 2: $ This-> Country = $ this-> getFlagStr ($ this-> EndIpOff + 4 ); // Echo sprintf ('endipoffset = (% x) ', $ this-> EndIpOff ); $ This-> Local = (1 = $ this-> CountryFlag )? '': $ This-> getFlagStr ($ this-> EndIpOff + 8 ); Break; Default: $ This-> Country = $ this-> getFlagStr ($ this-> EndIpOff + 4 ); $ This-> Local = $ this-> getFlagStr (ftell ($ this-> fp )); } } Function getFlagStr ($ offset ){ $ Flag = 0; While (1 ){ @ Fseek ($ this-> fp, $ offset, SEEK_SET ); $ Flag = ord (fgetc ($ this-> fp )); If ($ flag = 1 | $ flag = 2 ){ $ Buf = fread ($ this-> fp, 3 ); If ($ flag = 2 ){ $ This-> CountryFlag = 2; $ This-> EndIpOff = $ offset-4; } $ Offset = ord ($ buf [0]) + (ord ($ buf [1]) * 256) + (ord ($ buf [2]) * 256*256 ); } Else { Break; } } If ($ offset <12) Return ''; @ Fseek ($ this-> fp, $ offset, SEEK_SET ); Return $ this-> getStr (); } Function getStr () { $ Str = ''; While (1 ){ $ C = fgetc ($ this-> fp ); // Echo "$ cn "; If (ord ($ c [0]) = 0) Break; $ Str. = $ c; } // Echo "$ str n "; Return $ str; } Function qqwry ($ dotip = ''){ If (! Is_string ($ dotip) | $ dotip = '') {return ;} If (preg_match ("/^ 127/", $ dotip) {$ this-> Country = "local network"; return ;} Elseif (preg_match ("/^ 192/", $ dotip) {$ this-> Country = "LAN"; return ;} $ NRet; $ Ip = $ this-> IpToInt ($ dotip ); $ This-> fp = fopen (_ QQWRY __, "rb "); If ($ this-> fp = NULL ){ $ SzLocal = "OpenFileError "; Return 1; } @ Fseek ($ this-> fp, 0, SEEK_SET ); $ Buf = fread ($ this-> fp, 8 ); $ This-> FirstStartIp = ord ($ buf [0]) + (ord ($ buf [1]) * 256) + (ord ($ buf [2]) * 256*256) + (ord ($ buf [3]) * 256*256*256 ); $ This-> LastStartIp = ord ($ buf [4]) + (ord ($ buf [5]) * 256) + (ord ($ buf [6]) * 256*256) + (ord ($ buf [7]) * 256*256*256 ); $ RecordCount = floor ($ this-> LastStartIp-$ this-> FirstStartIp)/7 ); If ($ RecordCount <= 1 ){ $ This-> Country = "FileDataError "; Fclose ($ this-> fp ); Return 2; } $ RangB = 0; $ RangE = $ RecordCount; // Match... While ($ RangB <$ RangE-1) { $ RecNo = floor ($ RangB + $ RangE)/2 ); $ This-> getStartIp ($ RecNo ); If ($ ip = $ this-> StartIp) { $ RangB = $ RecNo; Break; } If ($ ip> $ this-> StartIp) $ RangB = $ RecNo; Else $ RangE = $ RecNo; } $ This-> getStartIp ($ RangB ); $ This-> getEndIp (); If ($ this-> StartIp <= $ ip) & ($ this-> EndIp >=$ ip )){ $ NRet = 0; $ This-> getCountry (); // This is not very good .......... $ This-> Local = str_replace ("area error", "", $ this-> Local ); } Else { $ NRet = 3; $ This-> Country = 'unknown '; $ This-> Local = ''; } Fclose ($ this-> fp ); $ This-> Country = preg_replace ("/(CZ88.NET) | (pure network)/", "Lan/unknown", $ this-> Country ); $ This-> Local = preg_replace ("/(CZ88.NET) | (pure network)/", "Lan/unknown", $ this-> Local ); ///// // Check the values 0 and 3 of $ nRet. then, comment out the following lines. Return $ nRet; // Return "$ this-> Country $ this-> Local"; # return the location and Country directly. } Function IpToInt ($ Ip ){ $ Array = explode ('.', $ Ip ); $ Int = ($ array [0] * 256*256*256) + ($ array [1] * 256*256) + ($ array [2] * 256) + $ array [3]; Return $ Int; } } ?>

The example is as follows:

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$ QQWry = new QQWry; $ QQWry-> QQWry ("60.31.95.255 "); $ Country = $ QQWry-> Country; Echo $ QQWry-> Country. ",". $ QQWry-> Local;

I hope this article will help you with php programming.

This article describes how to use PHP to determine the IP address and switch to the corresponding sub-station. The example analyzes the php URL parsing and jump skills...