我完成了我的第一堂课,但我无法将对象转换回字符串.

class Cryption

{

var $data;

var $salt;

function __construct($data, $salt)

{

$this->data = $data;

$this->salt = $salt;

}

function sha512()

{

$sodium = 'Na';

return hash_hmac("sha512", $this->data . $this->salt, $sodium);

}

function encrypt()

{

$salt = substr(sha512(($this->key), 'brownies'), 0, 30);

return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $salt, $this->data, MCRYPT_MODE_CBC, md5($salt)));

}

当我使用它时：

$password = new Cryption(mysql_real_escape_string(trim($_POST['password'])), 'pepper');

$password->sha512();

它说’PHP Catchable致命错误：类Cryption的对象无法转换为字符串’

我真的不知道怎么把它重新变成一个字符串.愿有人请帮帮我吗？

谢谢.

编辑：

require("config.php");

include("includes/cryption/cryption.php");

$username = mysql_real_escape_string(trim($_POST['username']));

$password = new Cryption(mysql_real_escape_string(trim($_POST['password'])), 'pepper'); //use a different salt next time such as a special salt for each user

$password->sha512();

$result = mysql_query("SELECT * FROM `administrators` WHERE username='$username' and password='$password'");

$row = mysql_fetch_row($result);

$count = mysql_num_rows($result);

if ($count == 1) {

if (isset($_POST['remember'])) {

session_start();

$_SESSION['user'] = array(

'id' => $row[0],

'username' => $row[1],

'password' => $row[2]

);

$userid = new Cryption($_SESSION['user']['id'], 'kkfishing');

$session = new Cryption($_SESSION['user']['username'], 'kkfishing');

$validated = new Cryption($_SESSION['user']['password'], 'kkfishing');

setcookie("uniqueid", $userid->encrypt(), time() + 60 * 60 * 24 * 100, "/"); //100 days

setcookie("kksessionid", $session->encrypt(), time() + 60 * 60 * 24 * 100, "/");

setcookie("kkuserid", $validated->encrypt(), time() + 60 * 60 * 24 * 100, "/");//disguised cookie name

}

session_start();

$_SESSION['authenticated'] = $row[0];

echo '1'; //true

exit;

}

else

{

echo '0'; //false

exit;

}

?>