note 16260 added to function.ip2long

Here's a function I whipped up today to deduce some important network information given a hostname (or its IP address) and its subnet mask: function find_net($host,$mask) { ### Function to determine network characteristics ### $host = IP address or hostname of target host (string) ### $mask = Subnet mask of host in dotted decimal (string) ### returns array with ### "cidr" => host and mask in CIDR notation ### "network" => network address ### "broadcast" => broadcast address ### ### Example: find_net("192.168.37.215","255.255.255.224") ### returns: ### "cidr" => 192.168.37.215/27 ### "network" => 192.168.37.192 ### "broadcast" => 192.168.37.223 ### $bits=strpos(decbin(ip2long($mask)),"0"); $net["cidr"]=gethostbyname($host)."/".$bits; $net["network"]=long2ip(bindec(decbin(ip2long(gethostbyname($host))) & decbin(ip2long($mask)))); $binhost=str_pad(decbin(ip2long(gethostbyname($host))),32,"0",STR_PAD_LEFT); $binmask=str_pad(decbin(ip2long($mask)),32,"0",STR_PAD_LEFT); for ($i=0; $i<32; $i++) { if (substr($binhost,$i,1)=="1" || substr($binmask,$i,1)=="0") { $broadcast.="1"; } else { $broadcast.="0"; } } $net["broadcast"]=long2ip(bindec($broadcast)); return $net; } -- http://www.php.net/manual/en/function.ip2long.php http://master.php.net/manage/user-notes.php?action=edit+16260 http://master.php.net/manage/user-notes.php?action=delete+16260 http://master.php.net/manage/user-notes.php?action=reject+16260