---

<?php

function encrypt($text, $key) {
    $result = '';
    $keyLength = strlen($key);
    $textLength = strlen($text);
    
    for ($i = 0; $i < $textLength; $i++) {
        $result .= chr(ord($text[$i]) ^ ord($key[$i % $keyLength]));
    }
    
    return base64_encode($result);
}

function decrypt($encryptedText, $key) {
    $text = base64_decode($encryptedText);
    $result = '';
    $keyLength = strlen($key);
    $textLength = strlen($text);
    
    for ($i = 0; $i < $textLength; $i++) {
        $result .= chr(ord($text[$i]) ^ ord($key[$i % $keyLength]));
    }
    
    return $result;
}

?>