PHP对IP地址和子网掩码的处理方法

来源:百度文库 编辑:神马文学网 时间:2024/03/29 13:26:30
ip2long IP地址转换成整型。long2ip 整型数据转换成IP。子网掩码转换成掩码长度方式:$slash_notation = strlen(preg_replace("/0/", "", decbin(ip2long($subnet_mask))));$bits=strpos(decbin(ip2long( ...
ip2long IP地址转换成整型。
long2ip 整型数据转换成IP。

子网掩码转换成掩码长度方式:
$slash_notation = strlen(preg_replace("/0/", "", decbin(ip2long($subnet_mask))));
$bits=strpos(decbin(ip2long($mask)),"0");

子网掩码位长转换成子网掩码形式:
$mask = 0xffffffff << (32 - $mask);
$mask = pow(2,32)-pow(2,(32-$mask));

判断两个地址是否在一个子网内:
function matchCIDR($addr, $cidr) {
list($ip, $mask) = explode('/', $cidr);
return (ip2long($addr) >> (32 - $mask) == ip2long($ip) >> (32 - mask));
}
?>

一个IPv4的类:

//--------------
// IPv4 class
class ipv4
{
var $address;
var $netbits;

//--------------
// Create new class
function ipv4($address,$netbits)
{
$this->address = $address;
$this->netbits = $netbits;
}

//--------------
// Return the IP address
function address() { return ($this->address); }

//--------------
// Return the netbits
function netbits() { return ($this->netbits); }

//--------------
// Return the netmask
function netmask()
{
return (long2ip(ip2long("255.255.255.255")
<< (32-$this->netbits)));
}

//--------------
// Return the network that the address sits in
function network()
{
return (long2ip((ip2long($this->address))
& (ip2long($this->netmask()))));
}

//--------------
// Return the broadcast that the address sits in
function broadcast()
{
return (long2ip(ip2long($this->network())
| (~(ip2long($this->netmask())))));
}

//--------------
// Return the inverse mask of the netmask
function inverse()
{
return (long2ip(~(ip2long("255.255.255.255")
<< (32-$this->netbits))));
}

}

$ip = new ipv4("192.168.2.1",24);
print "Address: $ip->address()\n";
print "Netbits: $ip->netbits()\n";
print "Netmask: $ip->netmask()\n";
print "Inverse: $ip->inverse()\n";
print "Network: $ip->network()\n";
print "Broadcast: $ip->broadcast()\n";
?>

这个做法比较有创意:
For those poor little people using PHP 3, here's an ip2long:
if (!function_exists("ip2long")) {
function ip2long($ip) {
$ex = explode(".", $ip);
if (count($ex)!=4) return -1;
list($a, $b, $c, $d) = $ex;
$a = $a*16777216;
$b = $b*65536;
$c = $c*256;
return $a+$b+$c+$d;
}
}
?>

#!/usr/local/bin/php
$ip_addr = "172.14.1.57";
$subnet_mask = "255.255.255.0";

$ip = ip2long($ip_addr);
$nm = ip2long($subnet_mask);
$nw = ($ip & $nm);
$bc = $nw | (~$nm);

echo "IP Address: " . long2ip($ip) . "\n";
echo "Subnet Mask: " . long2ip($nm) . "\n";
echo "Network Address: " . long2ip($nw) . "\n";
echo "Broadcast Address: " . long2ip($bc) . "\n";
echo "Number of Hosts: " . ($bc - $nw - 1) . "\n";
echo "Host Range: " . long2ip($nw + 1) . " -> " . long2ip($bc - 1) . "\n";
?>

Produces the output:

IP Address: 172.14.1.57
Subnet Mask: 255.255.255.0
Network Address: 172.14.1.0
Broadcast Address: 172.14.1.255
Number of Hosts: 254
Host Range: 172.14.1.1 -> 172.14.1.254