将IP地址转换为整型数字的PHP方法、Asp方法和MsSQL方法、MySQL方

将IP地址转换为整型数字的PHP方法、Asp方法和MsSQL方法、MySQL方

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的互转】:相对于MsSQL来说MySQL的转换方式比较简单,它和PHP一样也内置了两个函数

IP转为整型: select INET_ATON (IP地址) 和 整型转为IP: select INET_NTOA ( IP的整型数值 )

可以直接调用使用~