PHP bind_param 未定义

Question

我正在 MAMP 中工作，试图创建一个登录功能。
我的连接码是：

$servername = "localhost";
$username = "root";
$password = "root";
$db = "world";

$mysqli = new mysqli($servername, $username, $password, $db);

if($mysqli->connect_error){
    die("Connection failed: " . $conn->connect_error);
}

我的登录函数：

if (isset($_POST['email'], $_POST['p'])){
$email = $_POST['email'];
$password = $_POST['p']; //hashed password

if(login($email, $password, $mysqli) == true){
    header('Location: ../protected_page.php');
    }else{
    echo 'failed login';
    }
}
function login($email, $password, $mysqli){
if($stmt = $mysqli->prepare("SELECT USERID, USERNAME, PASSWORD, SALT FROM USERS WHERE EMAIL = ? LIMIT 1")){
    $stmt = $mysqli->bind_param('s', $email);
    $stmt->execute();
    $stmt->store_result();
    $stmt->bind_result($user_id, $username, $db_password, $salt);
    $stmt->fetch();
}

错误：

[17-Oct-2015 08:46:06 Europe/Berlin] PHP Fatal error: Call to undefined method mysqli::bind_param() in /Users.../Site/include/functions.php on line 24

Answer 1

http://php.net/manual/en/mysqli-stmt.bind-param.php

从手册中可以看出，这不是mysqli对象的方法，而是mysqli_stmt对象的方法。

当您运行 $stmt = $mysqli->bind_param('s', $email);

时，您也在销毁 mysqli_stmt 对象

Answer 2

您需要为您的声明调用 bind_param，如下所示：

$stmt->bind_param('s', $email);

您已经定义了 $stmt 前一行。 $mysqli 没有 bind_param 函数。

PHP bind_param 未定义

PHP bind_param not defined

php

mysqli

bindparam