What are the potential security risks associated with using a pre-made login template downloaded from the internet in PHP?

Using a pre-made login template downloaded from the internet in PHP can pose security risks such as vulnerabilities from outdated or insecure code, potential backdoors or malicious code inserted by the original creator, and lack of customization for specific security requirements. To mitigate these risks, it is recommended to thoroughly review and understand the code, update any outdated libraries or dependencies, sanitize input data to prevent SQL injection and cross-site scripting attacks, and implement secure password hashing techniques.

// Example of implementing secure password hashing using PHP password_hash() function

// Validate user login credentials
if ($_POST['username'] && $_POST['password']) {
    $username = $_POST['username'];
    $password = $_POST['password'];

    // Retrieve hashed password from the database based on the username
    $stored_password = ""; // Fetch hashed password from the database

    // Verify the password using password_verify() function
    if (password_verify($password, $stored_password)) {
        // Password is correct, proceed with login
    } else {
        // Password is incorrect, show error message
    }
}