PHP 將IP地址轉換為整型數字的PHP方法、Asp方法和MsSQL方法、html' target='_blank'>MySQL方法 首先我們要先了解一下IP地址轉換為整型(嚴格來說應該說是長整型)的原理~【轉換原理】：假設IP為：w.x.y.z，則IP地址轉為整型數字的計算公式為：intIP = 256*256*256*w + 256*256*x + 256*y + z【PHP的互轉】：PHP的轉換方式比較簡單，它內置了兩個函數 int ip2long ( string $ip_address )和 string long2ip ( string $proper_address ) 可以直接調用使用~【Asp的互轉】：自定義函數如下, '.-----------------------------------------------------------. '| describtion: 將IP轉換為int型數字 | '| Authors: abandonship(http://phpstudy.net) | '~-----------------------------------------------------------~ Function IP2Num(ByVal strIP) Dim nIP Dim nIndex Dim arrIP arrIP = Split(strIP, ".", 4) For nIndex = 0 To 3 If Not nIndex = 3 Then arrIP(nIndex) = arrIP(nIndex) * (256 ^ (3 - nIndex)) End If nIP = nIP + arrIP(nIndex) Next IP2Num = nIP End Function '.-----------------------------------------------------------. '| describtion: 將int型數字轉換為IP | '| Authors: abandonship(http://phpstudy.net) | '~-----------------------------------------------------------~ Function Num2IP(ByVal nIP) Dim strIP Dim nTemp Dim nIndex For nIndex = 3 To 0 Step -1 nTemp = Int(nIP / (256 ^ nIndex)) strIP = strIP & nTemp & "." nIP = nIP - (nTemp * (256 ^ nIndex)) Next strIP = Left(strIP, Len(strIP) - 1) Num2IP = strIP End Function【MsSQL的互轉】：自定義函數如下, /*************************************************************** *將IP轉換為int型數字 | *Code CreateBy abandonship(http://phpstudy.net) | **************************************************************/ CREATE FUNCTION [dbo].[ipToInt]( @strIp varchar(15) )RETURNS bigint AS BEGIN declare @nIp bigint set @nIp = 0 select @nIp = @nIp + LEFT( @strIp, charindex('.',@strIp+'.')-1)*Id from( select Id = cast(1*256*256*256 as bigint) union all select 1*256*256 union all select 1*256 union all select 1 ) as T return (@nIp) END
/*************************************************************** *將int型數字轉換為IP | *Code CreateBy abandonship(http://phpstudy.net) | **************************************************************/ CREATE FUNCTION [dbo].[intToIP]( @nIp bigint )RETURNS varchar(15) As BEGIN declare @strIp varchar(15) set @strIp = '' select @strIp = @strIp +'.'+ cast(@nIp/ID as varchar), @nIp = @nIp%ID from( select ID = cast(1*256*256*256 as bigint) union all select 1*256*256 union all select 1*256 union all select 1 ) as T return(stuff(@strIp,1,1,'')) END 【MySQL的互轉】：相對于MsSQL來說MySQL的轉換方式比較簡單，它和PHP一樣也內置了兩個函數 IP轉為整型: select INET_ATON (IP地址) 和 整型轉為IP: select INET_NTOA ( IP的整型數值 ) 可以直接調用使用~PHP教程
