What are the potential security risks associated with using raw user input in PHP code, as seen in the provided login script?

Using raw user input in PHP code can lead to security risks such as SQL injection, cross-site scripting (XSS), and other vulnerabilities. To mitigate these risks, it's important to sanitize and validate user input before using it in your code. One way to do this is by using PHP's filter_input function to filter and sanitize input data. 

$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$password = filter_input(INPUT_POST, 'password', FILTER_SANITIZE_STRING);

// Use the sanitized input in your code

Keywords

SQL injection cross-site scripting data validation input sanitization user authentication

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