编码和解码函数

 $data = "VGhpcyBpcyBhIAptdWx0aS1saW5lIG1lc3NhZ2UK";//解码前的值
 print ($data);
 print(base64_decode($data));      //进行解码
?>

 print("

---

");
 $text = "这是一个多行信息";
 print ($text);
 print(base64_encode($text));      //编码
?>