Are there any best practices for handling keyboard input in PHP scripts?

When handling keyboard input in PHP scripts, it is important to sanitize and validate user input to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks. One best practice is to use PHP's filter_input function to retrieve input from the user and apply appropriate filters to ensure the data is safe to use in your script.

// Example of handling keyboard input in PHP script
$user_input = filter_input(INPUT_POST, 'user_input', FILTER_SANITIZE_STRING);

if ($user_input) {
    // Process the sanitized user input
    echo "User input: " . $user_input;
} else {
    // Handle invalid input or display an error message
    echo "Invalid input";
}