PHP method, Asp method, MsSQL method, MySQL method to convert IP address to integer number_PHP tutorial

首先我们要先了解一下IP地址转换为整型(严格来说应该说是长整型)的原理~

【转换原理】：假设IP为：w.x.y.z，则IP地址转为整型数字的计算公式为：intIP = 256*256*256*w + 256*256*x + 256*y + z

【PHP的互转】：PHP的转换方式比较简单，它内置了两个函数
int ip2long ( string $ip_address )和 string long2ip ( string $proper_address )
可以直接调用使用~

【Asp的互转】：自定义函数如下,
'.-----------------------------------------------------------.
'|  describtion: 将IP转换为int型数字                           |
'|      Authors: abandonship(http://jb51.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: 将int型数字转换为IP                           |
'|      Authors: abandonship(http://jb51.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的互转】：自定义函数如下,
/***************************************************************
 * 将IP转换为int型数字                         |
 * Code CreateBy abandonship(http://jb51.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 

/***************************************************************
 * 将int型数字转换为IP                         |
 * Code CreateBy abandonship(http://jb51.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 conversion]: Compared to MsSQL, MySQL conversion method is relatively simple. Like PHP, it also has two built-in functions
IP to integer: select INET_ATON ( IP address) and convert integer to IP: select INET_NTOA (integer value of IP)
can be called and used directly~

http://www.bkjia.com/PHPjc/328016.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/328016.htmlTechArticleFirst we need to understand how the IP address is converted into an integer (strictly speaking, it should be a long integer) Principle~ [Conversion Principle]: Suppose the IP is: w.x.y.z, then the calculation of converting the IP address into an integer number...