Object of class .. could not be converted to string

问题:

I made my first class and I'm having trouble converting the objects back into strings.

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))); } 

When I use it:

$password = new Cryption(mysql_real_escape_string(trim($_POST['password'])), 'pepper'); $password->sha512(); 

It says 'PHP Catchable fatal error: Object of class Cryption could not be converted to string'

I don't really know how to get it back into a string. May someone please help me?

Thank you.

Edit:

<?php 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; } ?> 

回答1:

Look at this lines:

$password->sha512();  $result = mysql_query("SELECT * FROM `administrators` WHERE username='$username' and password='$password'"); 

$password is an object. It should be:

$pw = $password->sha512();  $result = mysql_query("SELECT * FROM `administrators` WHERE username='$username' and password='$pw'"); 

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