echo '<span>پسورد اشتباه است</span>';
این یه نمونه:
$username = $_POST['username'];
$password = $_POST['password'];
if( $username == '' )
$output = "login_emptyusername";
elseif( $password == '' )
$output = "login_emptypassword";
if($output == NULL) {
$conn = PDOconnection();
$sql = $conn->prepare('SELECT username FROM users WHERE username = :username');
$sql->bindParam(':username', $username);
$sql->execute();
if($sql->rowCount()) {
$sql = $conn->prepare('SELECT userpassword FROM users WHERE username = :username');
$sql->bindParam(':username', $username); $sql->execute();
if(hash_Verify($password, $sql->fetchColumn())) { // Input data is correct
require 'includes/class_user.php';
$currUser = new userObject( $username );
$currUser->login( isset($_POST['notforgot']) );
$output = "login_correct";
} else
$output = "login_wrongpassword";
} else
$output = "login_wrongusername";
}