Beginning PHP and MySQL: From Novice to Professional

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W. Jason Gilmore

"Beginning PHP and MySQL: From Novice to Professional"

To
remedy this, a few PHP functions and bitwise operations can be coaxed into doing
the calculations for you. When provided an IP address and a bitmask, Listing 16-3
calculates several of these components.
CHAPTER 16 ?– NETWORKING 421
Listing 16-3. A Subnet Converter

if (isset($_POST['submit'])) {
// Concatenate the IP form components and convert to IPv4 format
$ip = implode('.', $_POST['ip']);
$ip = ip2long($ip);
// Concatenate the netmask form components and convert to IPv4 format
$netmask = implode('.', $_POST['sm']);
$netmask = ip2long($netmask);
// Calculate the network address
$na = ($ip & $netmask);
// Calculate the broadcast address
$ba = $na | (~$netmask);
422 CHAPTER 16 ?– NE TWORKING
// Convert the addresses back to the dot-format representation and display
echo "Addressing Information:
";
echo "

IP Address: ".

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Accelerated DOM Scripting with Ajax, APIs, and Libraries (page 198) Systems Engineering with SysML/UML: Modeling, Analysis, Design (page 817) The Essential Guide to CSS and HTML Web Design (page 609)

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W. Jason Gilmore

"Beginning PHP and MySQL: From Novice to Professional"