/**
* Decrypts text with XXTEA algorithm.
*/
public static function decrypt($key, $text)
{
$k = XXTEA::str2long($key);
$v = XXTEA::str2long($text);
$n = count($v);
$z = $v[$n - 1];
$y = $v[0];
$d = 0.0;
$m = 0;
$e = 0;
$q = floor(6 + 52 / $n);
$s = $q * $d;
while ($s != 0) {
$e = XXTEA::urshift($s, 2) & 3;
for ($i = $n - 1; $i >= 0; $i--) {
$z = $v[$i > 0 ? $i - 1 : $n - 1];
$m = XXTEA::int32((XXTEA::urshift($z, 5) ^ $y << 2) + (XXTEA::urshift($y, 3) ^ $z << 4)) ^ XXTEA::int32(($s ^ $y) + ($k[$i & 3 ^ $e] ^ $z));
$y = $v[$i] = XXTEA::int32($v[$i] - $m);
}
$s = XXTEA::int32($s - $d);
}
return XXTEA::long2str($v);
}
