showcaller request/response encoder and decoder

main.php

<?php

$d = Decode("ezL2hGG2gbMjQmEsJpQzZoTic2AveaVvfKQiPnwhfR==");
print($d . "\n");
$e = Encode($d);
print($e . "\n");

function Decode($str)
{
    $str = str_split($str);
    $n = '';
    for ($i = 0; $i < count($str); $i++) {
        $charAt = ord($str[$i]);
        if (($charAt >= 48 && $charAt <= 57) || (($charAt >= 65 && $charAt <= 90) || ($charAt >= 97 && $charAt <= 122))) {
            $i2 = $charAt - ($i % 5);
            $charAt = ($i2 < 48 ? (122 - (48 - $i2)) + 1 : ($charAt < 65 || $i2 >= 65 ? ($charAt < 97 || $i2 >= 97 ? $i2 : (90 - (97 - $i2) ) + 1 ) : (57 - (65 - $i2) ) +1 ));
            $n .= chr($charAt);
        }
    }
    return base64_decode($n);
}

function Encode($str)
{
    $str = base64_encode($str);
    $str = str_split($str);
    $n = '';
    for ($i2 = 0; $i2 < count($str); $i2++) {
        $c2 = ord($str[$i2]);
        if (($c2 >= 48 && $c2 <= 57) || (($c2 >= 65 && $c2 <= 90) || ($c2 >= 97 && $c2 <= 122))) {
            $i3 = ($i2 % 5) + $c2;
            if ($i3 > 122) {
                $c2 = (($i3 - 122) + 48) - 1;
            } else if ($c2 <= 90 && $i3 > 90) {
                $c2 = (($i3 - 90) + 97) - 1;
            } else if ($c2 > 57 || $i3 <= 57) {
                $c2 = $i3;
            } else {
                $c2 = (($i3 - 57) + 65) - 1;
            }
        }
        $n .= chr($c2);
    }
    return $n;
}