[ Posted by Hadwin ] test decode func

fiddle_042294.php

<?php
function transformCode($number, $reverse = false)
{
    $number  = (string)$number;
    $len     = mb_strlen($number);
    $codeMap        = ['HwBm', 'AzFk', 'XdIp', 'KjJq', 'PlLs', 'QtMg', 'ErNe', 'DfOh', 'VbTv', 'GyUx', 'C' => 'CCCC'];
    $reverseCodeMap = ['H' => 0, 'w' => 0, 'B' => 0, 'm' => 0,
                            'A' => 1, 'z' => 1, 'F' => 1, 'k' => 1,
                            'X' => 2, 'd' => 2, 'I' => 2, 'p' => 2,
                            'K' => 3, 'j' => 3, 'J' => 3, 'q' => 3,
                            'P' => 4, 'l' => 4, 'L' => 4, 's' => 4,
                            'Q' => 5, 't' => 5, 'M' => 5, 'g' => 5,
                            'E' => 6, 'r' => 6, 'N' => 6, 'e' => 6,
                            'D' => 7, 'f' => 7, 'O' => 7, 'h' => 7,
                            'V' => 8, 'b' => 8, 'T' => 8, 'v' => 8,
                            'G' => 9, 'y' => 9, 'U' => 9, 'x' => 9,
                            'C' => 'C'];
    $codded = '';
    if(!$reverse)
    {
        for($i = 0; $i < $len; $i++)
            $codded .= $codeMap[$number[$i]][random_int(0,3)];
    }
    else
    {
        for($i = 0; $i < $len; $i++)
            $codded .= $reverseCodeMap[$number[$i]] ?? intval($number[$i]);
    }
    return $codded;
}
echo "AffiliateId: " . explode('C', transformCode('OCsJ', true))[0];
?>