生成包含预定义字符的5位字母数字代码

Question

I would like to generate a membership number consisting of alphanumeric characters, removing i o and l to save confusion when typing. to be done in php (also using Laravel 5.7 if that matters - but i feel this is a php question)

If simply using 0-9 the membership number would start at 00001 for the 1st one and the 11th person would have 00011. I would like to use alphanumeric characters from 0-9 + a-z (removing said letters)

0-9 (total 10 characters), abcdefghjkmnpqrstuvwxyz (total 23 characters) - this giving a total of 33 characters in each count cycle (0-10+a-Z). instead of just 10 (0-10)

So the first membership number would still be 00001 where as the 12th would now be 0000a, 14th 0000c and 34th would be 0001a.

To summarize i need a way of defining the characters for counting in a way that can be generated based on the id of a user.

I hope I have explained this well enough.

Answer 1

Assuming that these are the only characters you want to use:

0123456789abcdefghjkmnpqrstuvwxyz

You can use base_convert() and strtr() to translate specific characters of the result to the characters you want.

function mybase33($number) {
    return str_pad(strtr(base_convert($number, 10, 33), [
        'i' => 'j',
        'j' => 'k',
        'k' => 'm',
        'l' => 'n',
        'm' => 'p',
        'n' => 'q',
        'o' => 'r',
        'p' => 's',
        'q' => 't',
        'r' => 'u',
        's' => 'v',
        't' => 'w',
        'u' => 'x',
        'v' => 'y',
        'w' => 'z',
    ]), 5, '0', STR_PAD_LEFT);
}

echo "9 is ".mybase33(9)."
";
echo "10 is ".mybase33(10)."
";
echo "12 is ".mybase33(12)."
";
echo "14 is ".mybase33(14)."
";
echo "32 is ".mybase33(32)."
";
echo "33 is ".mybase33(33)."
";
echo "34 is ".mybase33(34)."
";

Output:

9 is 00009
10 is 0000a
12 is 0000c
14 is 0000e
32 is 0000z
33 is 00010
34 is 00011

https://3v4l.org/8YtaR

Explanation

The output of base_convert() uses these characters:

0123456789abcdefghijklmnopqrstuvw

The strtr() translates specific characters of that output to:

0123456789abcdefghjkmnpqrstuvwxyz