How can debugging techniques be applied to troubleshoot PHP login functionality?

Issue: PHP login functionality is not working properly, possibly due to incorrect validation or authentication logic. Fix: To troubleshoot PHP login functionality, check the following: 1. Ensure that the username and password are being correctly passed to the login script. 2. Verify that the input data is sanitized to prevent SQL injection attacks. 3. Check the authentication logic to ensure that the entered credentials match those stored in the database. 

<?php
// Check if the form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Sanitize input data
    $username = htmlspecialchars($_POST["username"]);
    $password = htmlspecialchars($_POST["password"]);

    // Validate the input data
    if (!empty($username) && !empty($password)) {
        // Authenticate user
        // Replace this with your authentication logic
        if ($username === "admin" && $password === "password") {
            echo "Login successful!";
        } else {
            echo "Invalid username or password.";
        }
    } else {
        echo "Please enter both username and password.";
    }
}
?>

Keywords

PHP debugging login functionality troubleshooting error types

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