我的代码有什么问题吗?我遇到了 bind_param 语句的致命错误。它声明“在第 35 行对 C:\xampp\htdocs\1102824H\Assignment2\copyspeech.php 中的非对象调用成员函数 bind_param()”。请帮忙。谢谢。
<?php
session_start();
// default user's name
$user = '';
// if visitor is logged in
$loggedIn = (!empty($_SESSION['user']));
// since user is logged in, let us retrieve user's name from $_SESSION
if ($loggedIn) {
$user = $_SESSION['user'];
} else {
// we only allow logged in user to see this page
// if visitor not logged in, redirect visitor to login page
header('Location: index.php');
exit;
}
$speechID = $_GET['id'];
// the file that contains your database credentials like username and password
require_once('config/database.php');
// see Lecture Webp_Week13_14_Using_PHPandMySQL(updating).pptx Slide 4 aka Step 1
$mysqli = new mysqli($database_hostname, $database_username, $database_password, $database_name) or exit("Error connecting to database");
// Slide 5 aka Step 2
$stmt = $mysqli->prepare("INSERT INTO assignment_speeches (id, subject, body, tags, image)
SELECT id, subject, body, tags, image
FROM assignment_speeches
WHERE id = ?");
// Slide 6 aka Step 3 the bind params must correspond to the ?
$stmt->bind_param("i", $speechID); // 1 ? so we use i. we use i because id is INT
// Slide 7 aka Step 4
$successfullyCopied = $stmt->execute();
// Slide 8 aka Step 5
// we won't check the delete result here.
// Slide 9 aka Step 6 and 7
$stmt->close();
$mysqli->close();
// if we successfully delete this, we
if ($successfullyCopied) {
$_SESSION['message'] = 'Successfully copied';
} else {
$_SESSION['message'] = 'Unable to copy';
}
header('Location: homepage.php');
?>