PHP实现IP数字互相转换
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>PHP中文网</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
</head>
<body>
<?php
/*
* 作者：XXXX
*/
//将IP转换为数字
function ipton($ip)
{
$ip_arr=explode('.',$ip);//分隔ip段
foreach ($ip_arr as $value)
{
$iphex=dechex($value);//将每段ip转换成16进制
if(strlen($iphex)<2)//255的16进制表示是ff，所以每段ip的16进制长度不会超过2
{
$iphex='0'.$iphex;//如果转换后的16进制数长度小于2，在其前面加一个0
//没有长度为2，且第一位是0的16进制表示，这是为了在将数字转换成ip时，好处理
}
$ipstr.=$iphex;//将四段IP的16进制数连接起来，得到一个16进制字符串，长度为8
}
return hexdec($ipstr);//将16进制字符串转换成10进制，得到ip的数字表示
}
//将数字转换为IP，进行上面函数的逆向过程
function ntoip($n)
{
$iphex=dechex($n);//将10进制数字转换成16进制
$len=strlen($iphex);//得到16进制字符串的长度
if(strlen($iphex)<8)
{
$iphex='0'.$iphex;//如果长度小于8，在最前面加0
$len=strlen($iphex); //重新得到16进制字符串的长度
}
//这是因为ipton函数得到的16进制字符串，如果第一位为0，在转换成数字后，是不会显示的
//所以，如果长度小于8，肯定要把第一位的0加上去
//为什么一定是第一位的0呢，因为在ipton函数中，后面各段加的'0'都在中间，转换成数字后，不会消失
for($i=0,$j=0;$j<$len;$i=$i+1,$j=$j+2)
{//循环截取16进制字符串，每次截取2个长度
$ippart=substr($iphex,$j,2);//得到每段IP所对应的16进制数
$fipart=substr($ippart,0,1);//截取16进制数的第一位
if($fipart=='0')
{//如果第一位为0，说明原数只有1位
$ippart=substr($ippart,1,1);//将0截取掉
}
$ip[]=hexdec($ippart);//将每段16进制数转换成对应的10进制数，即IP各段的值
}
$ip = array_reverse($ip);
return implode('.', $ip);//连接各段，返回原IP值
}
echo ipton('119.255.31.226');
echo '<br>';
$num='379374783';
echo strlen($num).'<br/>';
echo ntoip($num).'<br/>';
echo 'trueipnum:'.ip2long('119.255.31.226').'<br/>';
echo 'trueip:'.long2ip('3793747831');
?>
</body>
</html>mysql自带了inet_aton函数来实现将ip地址转换为数字，inet_ntoa函数将数字转换为ip。
SELECT INET_ATON( '10.122.22.1' )
上面的转换函数为站长原创，碰巧实现了跟mysql系统函数相同的转换效果，呵呵，兴奋好久~~
原来PHP提供了ip2long和long2ip2个函数来实现IP与数字的转换，站长做了无用功了，不过权当锻炼逻辑思维吧~~
这是两种实现方法，一种是在程序上实现；一种是直接在sql语句中实现，很方便，不错，保存下来了，发到自己的博客，以后就不会忘记了。
把ip数据保存在数据库(MySQL)中时候,我们习惯用ip2long函数生成整型,然后存放在一个int(11)类型的字段中,但是,在不同的系统平台上,ip2long函数得到的值是不同的,因此可能造成在从数据库中读出数据,用long2ip得到ip的时候产生错误,说一下我们碰到的情况:
我们用一个int(11)类型(范围-2147483648 - 2147483647)来保存把一个ip地址用ip2long处理得到的结果,例如ip是’202.105.77.179′,那么在32位机器上得到的结果是:-899068493,而在64位机器上却得到3395898803.然后把它写入数据库,由于超过int(11)的范围,因此64位机器上的结果被保存为int(11)的最大值:2147483647.于是在从数据库中取出的时候,便得到了错误的结果,会得到”127.255.255.255″这个ip地址.
解决的办法很多,比如可以用mysql的函数:INET_ATON和INET_NTOA来处理ip地址;或者把保存ip地址的字段改为bigint类型,这样在64位机器上虽然保存的是3395898803,使用long2ip函数仍能得到正确的结果.
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