我正在使用 Mac OS、mamp、phpmyadmin 創(chuàng)建一個(gè)簡單的登錄表單。我在 php myadmin 和第一個(gè)用戶中創(chuàng)建了我的數(shù)據(jù)庫。我確定用戶名和密碼正確（根據(jù)我的數(shù)據(jù)庫），但我收到密碼不正確的錯(cuò)誤。我松散地遵循本教程https://www.tutorialrepublic.com/php-tutorial/php-mysql-login-system.php我相信這可能會(huì)導(dǎo)致錯(cuò)誤，但我不確定。$hashed_password = $row["password"];                        if(password_verify($password, $hashed_password)){<?php// Initialize the sessionsession_start();// Check if the user is already logged in, if yes then redirect him to welcome pageif(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true){    header("location: welcome.php");    exit;}// Include config filerequire_once "config.php";// Define variables and initialize with empty values$username = $password = "";$username_err = $password_err = "";// Processing form data when form is submittedif($_SERVER["REQUEST_METHOD"] == "POST"){    // Check if username is empty    if(empty(trim($_POST["username"]))){        $username_err = "Please enter username.";    } else{        $username = trim($_POST["username"]);    }    // Check if password is empty    if(empty(trim($_POST["password"]))){        $password_err = "Please enter your password.";    } else{        $password = trim($_POST["password"]);    }    // Validate credentials    if(empty($username_err) && empty($password_err)){        // Prepare a select statement        $sql = "SELECT id, username, password FROM users WHERE username = :username";        if($stmt = $pdo->prepare($sql)){            // Bind variables to the prepared statement as parameters            $stmt->bindParam(":username", $param_username, PDO::PARAM_STR);            // Set parameters            $param_username = trim($_POST["username"]);?>我希望被帶到我的歡迎屏幕。