使用PHP显示完整的1-128位十进制到二进制

时间:2013-01-24 10:28:24

标签: php binary

我知道这种接缝很容易,但我对这种特殊情况有疑问。 我已经知道如何使用PHP将十进制转换为二进制,但我想显示 完整的位序列,但令人惊讶的是,我不知道如何。

转换必须如下:

converting 127(decimal) to binary using PHP = 1111111. the bit sequence is 1-128 for every 
octet(IP Address) so this must output = 01111111 even 128 is not used.
2nd Example:
1(decimal) to binary = 01. Want to display the full 1-128 binary sequence even if
128,64,32,16,8,4,2 is not used it must be like this 00000001 not 01.

这是我的PHP代码:

<?php

        $octet1 = $_POST["oct1"];
        $octet2 = $_POST["oct2"];
        $octet3 = $_POST["oct3"];
        $octet4 = $_POST["oct4"];
        echo decbin($octet1) ," ", decbin($octet2) ," ", decbin($octet3) ," ", decbin($octet4);

    ?>

这只显示缩短的二进制文件,如下所示:

16 to binary is 10000 or but i want to display this 00010000(Full length)

我该怎么做?

2 个答案:

答案 0 :(得分:5)

如何将sprintf b 格式说明符一起使用:

echo sprintf("%08b", 127);
// 01111111
echo sprintf("%08b.%08b.%08b.%08b", 127, 0, 0, 1);
// 01111111.00000000.00000000.00000001

答案 1 :(得分:1)

你需要填充它:

echo str_pad($str, 8, '0', STR_PAD_LEFT);