How can PHP developers effectively debug and troubleshoot login form issues?

To effectively debug and troubleshoot login form issues in PHP, developers can start by checking if the form data is being submitted correctly and if the login credentials are being validated properly. They can also check for any errors in the database query or authentication process. Additionally, developers can use tools like var_dump() or print_r() to display the values of variables and pinpoint where the issue may be occurring. 

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Validate login credentials
    // Check database for user with matching username and password
    
    if ($valid_login) {
        // Redirect user to dashboard
        header("Location: dashboard.php");
    } else {
        // Display error message
        echo "Invalid username or password";
    }
}

Keywords

PHP debugging troubleshooting login form error handling authentication

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