PHP system chancing case of urlencode

Question

I am sending a urlencoded string to a system which they are then sending back to me, but the URL encoded characters have a lowercase instead of uppercase character in them.

Is there an easy way for me to find each instance and change it to uppercase?

Here's an example

What I am sending:

6Vc6K83k%2FnBWb6sOfc0fcQiMOttpKJci9o%2B%2BdMBs0MCGJgQkgyr6zV%2FO8hqRATKW1uUYEs5zOqKso36x%2BydCc6

What I get in return:

6Vc6K83k%2fnBWb6sOfc0fcQiMOttpKJci9o%2b%2bdMBs0MCGJgQkgyr6zV%2fO8hqRATKW1uUYEs5zOqKso36x%2bydCc6

Thanks!

Why does it need to be changed? It sounds like you're trying to solve a symptom of a different problem entirely. — David
– David, Commented Oct 25, 2013 at 16:55
Because that information is a semi-encrypted hash and it's messing up the decryption method on the receiving end. — Scott
– Scott, Commented Oct 25, 2013 at 16:58
Maybe url-decode it and then url-encode it again? If the decoding step succeeds in producing the original string, then re-encoding it should result in the same value you originally sent. — David
– David, Commented Oct 25, 2013 at 17:01

Community · Accepted Answer · 2017-05-23 10:31:47Z

Use preg_replace_callback and replace /%[a-zA-Z0-9]{2}/ with its uppercase equivalent using strtoupper:

5.3+:

$string = preg_replace_callback('/%[a-zA-Z0-9]{2}/', function($match) {
    return strtoupper($match[0]);
}, $string);

Less than 5.3:

function preg_replace_callback_uppercaser($match) {
    return strtoupper($match[0]);
}
$string = preg_replace_callback('/%[a-zA-Z0-9]{2}/', 'preg_replace_callback_uppercaser', $string);

Demo

<?php
    $string = '6Vc6K83k%2fnBWb6sOfc0fcQiMOttpKJci9o%2b%2bdMBs0MCGJgQkgyr6zV%2fO8hqRATKW1uUYEs5zOqKso36x%2bydCc6';

    $string = preg_replace_callback('/%[a-zA-Z0-9]{2}/', function($match) {
        return strtoupper($match[0]);
    }, $string);

    var_dump($string);
?>

Outputs:

string(96) "6Vc6K83k%2FnBWb6sOfc0fcQiMOttpKJci9o%2B%2BdMBs0MCGJgQkgyr6zV%2FO8hqRATKW1uUYEs5zOqKso36x%2BydCc6"

Link to live demo

Alternatively, David's $string = urlencode(urldecode($string)); works fine.

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