自動目錄

由於 IPv4 可以轉成十進位用推移的運算，但是 IPv6 要轉成十進位的話，會超過有效位數的顯示，另外由於ipv6本身是用十六進位表示，沒必要換成10進位。所以要用更漂亮的作法。我把他寫成 class  = =!!：

函式

/**

* ipv6 class by axer@ms1.boe.tcc.edu.tw

*/

class ipv6{

/**

* ExpandIPv6Notation2Bin()- Convert an ipv6 address to bin string

* @param string $ip6 - an ipv6 address

* @return return the binary string of an ipv6 address if parameter ip6 is an ipv6 address,

* else it return an empty string.

*/

public function ExpandIPv6Notation2Bin($ip6) {

if (strpos($ip6, '::') !== false)

$ip6 = str_replace('::', str_repeat(':0', 8 - substr_count($ip6, ':')).':', $ip6);

$ip6parts = explode(':', $ip6);

$res="";

foreach ($ip6parts as $part)

$res .= str_pad(base_convert( $part, 16, 2), 16, 0, STR_PAD_LEFT);

return $res;

}

/**

* MatchCIDR6 -- Check if an ipv6 address is in the CDIR6 subnet.

* @param string $cidr6 - an ipv6 subnet, ex 2001:288:5400/39 or 2001:288:5432:/64 or 2001:288:5478::/64..

* @param string $chkipv6 - an ipv6 address, ex ::1, 2001:288:5200::1, :: ,etc.

* @return return true if $chkipv6 is inside the $cidr6 subnet, or return false.

*/

public function MatchCIDR6( $cidr6, $chkipv6)

{

list($ip6, $prefixlen) = explode('/', $cidr6);

$cidrbin= substr( $this->ExpandIPv6Notation2Bin($ip6), 0, $prefixlen);

$chkip6bin= substr( $this->ExpandIPv6Notation2Bin($chkipv6), 0, $prefixlen);

if(! strcmp($cidrbin,$chkip6bin))return true;

return false;

}

}

用法

$cidr6 = "2001:288:5400/39";

$ip6= "2001:288:5300:000::72A:4BE7";

$o_ipv6 = new ipv6();

// 檢查是ip6 是否在網段內

if( $o_ipv6->MatchCIDR6($cidr6,$ip6))

print "Inside";

else

print "Outside";

備註：有參考別人的程式，不過來源佚失了

相關連結

原文 2009-11-26