CODEWITHSUNDEEP
phparraysmath
Newbie
Newbie

Reputation: 37

Increase the number by one in PHP from array of IP addresses

I want to add to every IP address from array +1 number. I know about bcadd(); but I can't make it work as every IP address has different length and I just need to increase the last number of it.

For example:

array("194.32.14.152", "4.189.23.35", etc...);

... would become:

array("194.32.14.153", "4.189.23.36", etc...);

Now maybe I need to apply str_pad(); to match the last dot?

Any help would be appreciated.

Upvotes: 2

Views: 642

Answers (3)

mickmackusa
mickmackusa

Reputation: 48101

preg_replace_callback(), IMO, is the most succinct and appropriate approach. When there is a single, native function that does it all, why do anything else?

Match the final sequence of digits and so long as it is not 255, increment the substring.

Code: (Demo)

$ips = ["194.32.14.199", "4.189.23.35", "4.189.23.255"];

var_export(preg_replace_callback('~\d+$(?<!255)~',
             function($m) {
                 return ++$m[0];
             },
             $ips)
          );

From PHP7.4+, the syntax becomes more brief by way of arrow syntax.

var_export(preg_replace_callback('~\d+$(?<!255)~', fn($m) => ++$m[0], $ips));

Both snippets produce:

array (
  0 => '194.32.14.200',
  1 => '4.189.23.36',
  2 => '4.189.23.255',
)

The pattern:

\d+        #match 1 or more digits
$          #match the end of the string
(?<!255)   #lookbehind to ensure the matched number is not literally 255

In using this pattern, you do not bother handling 255, and you increment all other numbers that are matched.

Upvotes: 2

Accountant م
Accountant م

Reputation: 7533

Another solution using built-in ip2long and long2ip and PHP bitwise operators

<?php

$ips = array("194.32.14.152", "4.189.23.35", "4.51.11.255");
$newIps = [];
foreach($ips as $ipString){
    $ip = ip2long($ipString);
    $lastByte = ($ip & 0x000000FF)+1;
    $lastByte = $lastByte > 255 ? 255 : $lastByte;
    $newIps[]= long2ip(( $lastByte ) | (0xFFFFFF00 & $ip ) );
}
var_dump($newIps);

This outputs

array(3) {
  [0]=>
  string(13) "194.32.14.153"
  [1]=>
  string(11) "4.189.23.36"
  [2]=>
  string(11) "4.51.11.255"
}

Live demo https://3v4l.org/iZeAR

Upvotes: 1

Nick Parsons
Nick Parsons

Reputation: 50974

You can map your array to your new IP addresses. In the map method, you can split the current string by . using explode(). Then, to get the last number from your IP you can use array_pop, which you can then cast to an integer so that you can add one to it. You can then array_push() this updated value onto your parts array, and join each part in your array back together using implode().

See example below:

$arr = array("194.32.14.152", "4.189.23.35", "4.189.23.255");

$res = array_map(function($v) { // Example, let $v = "194.32.14.152";
  $parts = explode('.', $v); // "194.32.14.152" -> ["194", "32", "14", "152"];
  array_push($parts, min((int) array_pop($parts)+1, 255)); // ["194", "32", "14", 153]
  return implode('.', $parts); // "194.32.14.153"
}, $arr);

print_r($res); // ["194.32.14.153", "4.189.23.36", "4.189.23.255"]

Upvotes: 1

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