Question

我正在尝试创建一个登录脚本，用于收集用户发布的信息，然后在用户提供相关信息时创建会话。每次我尝试登录时都会收到错误：

PHP Fatal error: Call to a member function bind_param() on boolean

我在下面提供了我的代码：要求＆＃39; ../../../ db-config.php＆＃39 ;; 要求＆＃39; ../ distributor-config.php＆＃39;;

$user_role = $_POST['user_role'];
$user_username = $_POST['user_username'];
$user_password = $_POST['user_password'];

$stmt = $conn->prepare("SELECT role, id, emailaddress, username, firstname, surname FROM users WHERE role = ?, username = ?, password = ?");
$stmt->bind_param("sss", $user_role, $user_username, $user_password);
$stmt->execute();

$stmt->bind_result($role, $id, $emailaddress, $username, $firstname, $surname);

while($stmt->fetch()) {
    if($stmt == 1 && $user_role == 'Manager') {
        session_start();
        $_SESSION['userinfo']['role'] = $id;
        $_SESSION['userinfo']['id'] = $id;
        $_SESSION['userinfo']['emailaddress'] = $emailaddress;
        $_SESSION['userinfo']['username'] = $username;
        $_SESSION['userinfo']['firstname'] = $firstname;
        $_SESSION['userinfo']['surname'] = $surname;

        header('location: ../manager-index.php?page=login&status=success');
    }

    elseif($stmt == 1 && $user_role == 'User') {
        session_start();
        $_SESSION['userinfo']['role'] = $id;
        $_SESSION['userinfo']['id'] = $id;
        $_SESSION['userinfo']['emailaddress'] = $emailaddress;
        $_SESSION['userinfo']['username'] = $username;
        $_SESSION['userinfo']['firstname'] = $firstname;
        $_SESSION['userinfo']['surname'] = $surname;

        header('location: ../user-index.php?page=login&status=success');
    }

    else {
        header('location: ../login.php?page=login&status=error');
    }
}

$stmt->close();
$conn->close();

Answer 1

问题出在SQL语句中。如果SQL失败，则返回FALSE

请参阅：stackoverflow.com

public function render(View $view, $route = null, $obj = null, $method = 'POST') {
$driverTypeList = DriverType::getArray();
$view->with(compact('driverTypeList'));
return parent::render($view, $route, $obj, $method);
}

Answer 2

这是错误的：

$ stmt = $ conn-＆gt; prepare（“SELECT role，id，emailaddress，username， firstname，surname FROM users WHERE role = ?, username =？，password = ？“）;

应该是：

$stmt = $conn->prepare("SELECT role, id, emailaddress, username, firstname, surname FROM users WHERE role = ? AND username = ? AND  password = ?");

Answer 3

查看此地点删除逗号，添加并在条件

$stmt = $conn->prepare("SELECT role, id, emailaddress, username, firstname, surname FROM users WHERE role = ? AND username = ? AND  password = ?");

Docs refer the mysqli prepared statement

注意：

1）session_start（）;应该是一次，也应该在页面最顶层

在boolean上调用成员函数bind_param（）（MySQLi未运行）

3 个答案: