Random string by encoding

Question

I need logic or some package with functionality to generate random string with specific encoding without using base function random_bytes etc.

Something like this:

$randomLine = random_string($length = 10, $encoding = 'UTF-16');

Do you need the string need to be randomly spread over all the characters in the given encoding? Or could you generate a random string in a more simple encoding (say ASCII) and then convert it? Because the former will be considerably harder. Also *without using base function random_bytes etc* - why? Because again, that's going to be much more difficult. What *can* you use? — iainn, Sep 17 '18 at 12:28
@iainn I need this specific functionality for hard tests of my service — Kart Av1k, Sep 17 '18 at 13:55

score 0 · Accepted Answer · answered Sep 17 '18 at 12:37

0

If you have php 7.2+, you can use mb_chr, like this

<?
$max = 10;
$out = '';
$encoding = 'UTF-16';
for ($i = 0;$i<$max;$i++) {
    if ($s = mb_chr(rand(1,1114112), $encoding)) {
        $out .= $s;
    }
}

echo $out;

See http://sandbox.onlinephpfunctions.com/code/a4d39412005473231317758ca5d2fc8d4ad0b27b

answered Sep 17 '18 at 12:37

Chris Lear

6,592
1
18
26

See https://en.wikipedia.org/wiki/Code_point There are 1114112 unicode code points. – Chris Lear Sep 17 '18 at 14:18
Is there any variants for php with version less than 7.2? – Kart Av1k Sep 18 '18 at 13:41
Look at https://stackoverflow.com/questions/1365583/how-to-get-the-character-from-unicode-code-point-in-php, specifically the second answer (polyfill for mb_chr) – Chris Lear Sep 18 '18 at 14:19

Random string by encoding

1 Answers1