Method of IP address mask operation in PHP _php tips

The example of this article describes the approach of PHP for IP address mask operation. Share to everyone for your reference, specific as follows:

IP Resolution:

function Ip_parse ($ip _str) {
 $mark _len =;
 if (Strpos ($ip _str, "/") > 0) {
  list ($ip _str, $mark _len) = Explode ("/", $ip _str);
 }
 $ip = Ip2long ($ip _str);
 $mark = 0xFFFFFFFF << (32-$mark _len) & 0xFFFFFFFF;
 $ip _start = $ip & $mark;
 $ip _end = $ip | (~ $mark) & 0xFFFFFFFF;
 Return Array ($ip, $mark, $ip _start, $ip _end);
Demo:
list ($ip, $mark, $ip _start, $ip _end) = Ip_parse ("192.168.1.12/24");
echo "IP address:", Long2ip ($IP), "\ n";
echo "Subnet mask:", Long2ip ($mark), "\ n";
echo "IP segment start:", Long2ip ($ip _start), "\ n";
echo "IP segment End:", Long2ip ($ip _end), "\ n";

Results:

IP address: 192.168.1.12
subnet Mask: 255.255.255.0
IP segment start: 192.168.1.0
IP segment end: 192.168.1.255

IP is in the IP segment:

function ip_in ($IP, $ip _str) {
 $mark _len =;
 if (Strpos ($ip _str, "/") > 0) {
  list ($ip _str, $mark _len) = Explode ("/", $ip _str);
 }
 $right _len = 32-$mark _len;
 Return Ip2long ($IP) >> $right _len = = Ip2long ($ip _str) >> $right _len
;
Demo:
var_dump (ip_in ("192.168.1.1", "192.168.1.0/24"));

PS: Here again for you to provide an online subnet mask calculation tool for everyone to use for reference:
Online Network Calculator | TCP/IP subnet mask calculation and conversion tool:
Http://tools.jb51.net/aideddesign/ipcalc

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I hope this article will help you with the PHP program design.