   #PHP Manual Network Functions getservbyport long2ip

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                                    ip2long

   (PHP 4 )
   ip2long --  Converts a string containing an (IPv4) Internet Protocol
   dotted address into a proper address.

Description

   int ip2long ( string ip_address)

   The function ip2long() generates an IPv4 Internet network address from
   its Internet standard format (dotted string) representation. If
   ip_address is invalid than -1 is returned. Note that -1 does not
   evaluate as FALSE in PHP.

   Example 1. ip2long() Example
   <?php
   $ip = gethostbyname("www.example.com");
   $out = "The following URLs are equivalent:<br />\n";
   $out .= "http://www.example.com/, http://" . $ip . "/, and http://" .
   sprintf("%u", ip2long($ip)) . "/<br />\n";
   echo $out;
   ?>

     Note: Because PHP's integer type is signed, and many IP addresses
     will result in negative integers, you need to use the "%u"
     formatter of sprintf() or printf() to get the string representation
     of the unsigned IP address.

   This second example shows how to print a converted address with the
   printf() function :

   Example 2. Displaying an IP address
   <?php
   $ip   = gethostbyname("www.example.com");
   $long = ip2long($ip);
   if ($long === -1) {
       echo "Invalid IP, please try again";
   } else {
       echo $ip   . "\n";           // 192.0.34.166
       echo $long . "\n";           // -1073732954
       printf("%u\n", ip2long($ip)); // 3221234342
   }
   ?>

     Note: ip2long() will return -1 for the ip 255.255.255.255

   See also long2ip() and sprintf().
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