從PHP中的字符串中增加/減少MAC地址

Question

我有一個字符串形式的MAC地址。我有興趣參加在Mac串並增加/ 1個值減小，但同時保持十六進制的完整性，PHP

例如：00：A1：2C：3B：99：1F

-1：00： A1：2C：3B：99：1E 1：00：A1：2C：3B：99：20

Answer 1

轉換十六進制到十進制和背面

$hexstring = "00:A1:2C:3B:99:1F"; 
$hex = preg_replace("/:/", '', $hexstring); 

$dec = hexdec($hex); 
$dec--; //or ++ 

$hex = dechex($dec); 

$hexstring = implode(":", str_split($hex, 2)); 

Answer 2

測試

<?php 
$hexval="00:A1:2C:3B:99:1F"; 

//First 10 MAC Address Increments 
for($i=0;$i<10;$i++) 
{ 
    $dec=hexdec($hexval); 
    $dec++; 
    $hexval=dechex($dec); 
    $hexval=rtrim(strtoupper(chunk_split($hexval, 2, ':')),':'); 
    echo "00:A1:{$hexval}<br>"; 
} 
echo "<br><br>"; 
//First 10 MAC Address Decrements 
$hexval="00:A1:2C:3B:99:1F"; 
for($i=0;$i<10;$i++) 
{ 
    $dec=hexdec($hexval); 
    $dec--; 
    $hexval=dechex($dec); 
    $hexval=rtrim(strtoupper(chunk_split($hexval, 2, ':')),':'); 
    echo "00:A1:{$hexval}<br>"; 
} 

OUTPUT：

00:A1:2C:3B:99:20 
00:A1:2C:3B:99:21 
00:A1:2C:3B:99:22 
00:A1:2C:3B:99:23 
00:A1:2C:3B:99:24 
00:A1:2C:3B:99:25 
00:A1:2C:3B:99:26 
00:A1:2C:3B:99:27 
00:A1:2C:3B:99:28 
00:A1:2C:3B:99:29 


00:A1:2C:3B:99:1E 
00:A1:2C:3B:99:1D 
00:A1:2C:3B:99:1C 
00:A1:2C:3B:99:1B 
00:A1:2C:3B:99:1A 
00:A1:2C:3B:99:19 
00:A1:2C:3B:99:18 
00:A1:2C:3B:99:17 
00:A1:2C:3B:99:16 
00:A1:2C:3B:99:15