Question

常量只包含数据库连接详细信息

require_once 'includes/constants.php';
class mysql{
    private $conn;

    function __construct(){
        $this->conn = $conn = new MySQLi(DB_SERVER, DB_USER, DB_PASSWORD, DB_NAME)
            or die ('There was an error in the connection');
        }

    function verify ($un, $pwd){


             $query = "SELECT * FROM User WHERE username = ? AND pass = ? LIMIT 1"; 

             if ($stmt = $this->conn->prepare($query))
             {
                 $stmt->bind_param('ss', $un, $pwd);
                 $stmt->execute();

                 if ($stmt->fetch());{
                     $stmt->close();
                     return true;
                     }
             }
        }

    }

?>

从登录页面传递了un和pwd，它们是从用户输入中提取的，我遇到的问题是用户总是登录，无论他们输入什么，它似乎都没有正确验证数据库

Answer 1

更改此

if ($stmt->fetch());{
   $stmt->close();
   return true;
}

到

 if ($stmt->fetch()){
   $stmt->close();
   return true;
}else
{ return false;}

Answer 2

if ($stmt->fetch());{
                   ^------- THIS!
    $stmt->close();
    return true;
}

此if之后是空语句，之后会出现一个新的{...}个语句块。 if仅与空语句关联，因此始终执行以下块。

举例说明：

if (false)
    /* do nothing */;

{
    echo 'always goes here';
}

摆脱多余的;。

PHP登录验证

2 个答案: