Question

SIGNUP.PHP/HTML
<?php
    require_once("connections/db.php");

    $error = array();
    if($user->is_loggedin())
    {
        $user->redirect('index.php');
    }

    if(isset($_POST['signup-btn']))
    {
      $username = $_POST['signup-username'];
      $password = $_POST['signup-password'];
      $email = $_POST['signup-email'];

      if($user='')
      {
          $error[] = "Please enter a username";
      }
      else if($pass='')
      {
          $error[] = "Please enter a password";
      }
      else if(!filter_var($email, FILTER_VALIDATE_EMAIL))
      {
          $error[] = "Please enter a valid email address";
      }
      else
   {
      try
      {
            if($user->register($username, $password, $email))
            {
                echo "registered";
            }
     }
     catch(PDOException $e)
     {
        echo $e->getMessage();
     }
  }
    }
   ?>

class.user.php

<?php
class USER{

    private $db;

    function __construct($db_con)
    {
        $this->db = $db_con;
    }

    public function register($username,$password,$email)
    {
        try
        {
          $protected_password = password_hash($upass, PASSWORD_DEFAULT);
          $stmt = $this->db->prepare("INSERT INTO users(username,password,email)
          VALUES(:username, :password, :email)");

           $stmt->bindparam(":username", $username);
           $stmt->bindparam(":password", $protected_password);
           $stmt->bindparam(":email", $email);
           $stmt->execute();

           return $stmt;
        }

        catch(PDOException $e)
        {
            echo $e->getMessage();
        }
    }

    public function is_loggedin()
    {
        if (isset($_SESSION['user_session']))
        {
            return true;
        }
    }

    public function redirect($url)
    {
        header("Location: $url");
    }

    public function logout()
    {
        session_destroy();
        unset($_SESSION['user_session']);
        return true;
    }
}


?>

db.php中

<?php
session_start();

$connection = parse_ini_file('config.ini');

try{
    $db_con = new PDO("mysql:host={$connection['host']}; dbname={$connection['dbname']}", $connection['username'], $connection['password']);
    $db_con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}

catch(PDOException $e){
    echo $e->getMessage();
}


include_once 'class.user.php';
$user = new USER($db_con);
?>

我一直收到错误致命错误：在第32行的C：\ xampp \ we \ signup.php中调用字符串上的成员函数register（）

我对PDO完全陌生。我无法理解为什么这不起作用。我尝试尽可能多地更改代码，但此错误并未发生变化。我确定这是一个我忽视的简单愚蠢的问题。

Answer 1

我们开始从您的表单

设置$username

$username = $_POST['signup-username'];

然后我假设对这个变量（$username == ''？）进行了等式检查，但是将$user设置为空字符串。

if($user='')
{
    $error[] = "Please enter a username";
}

之后，系统会调用$user->register()，$user仍然是字符串，而不是您的班级USER的实例。

请注意，如果您想在其他地方进行平等检查，请不要进行变量分配！我一直这样做。

if($user='')
{
    $error[] = "Please enter a username";
}
else if($pass='') // should this be $password == ''?
{
    $error[] = "Please enter a password";
}

我使用了正确的代码，但仍然返回false

1 个答案: