How can PHP functions be utilized to streamline the process of managing and displaying user-submitted content on a website?

Managing and displaying user-submitted content on a website can be streamlined using PHP functions to sanitize and validate the input data. By creating functions to handle tasks like escaping HTML characters, filtering out malicious code, and validating input against predefined rules, you can ensure that the content displayed on your website is safe and accurate.

// Function to sanitize user input
function sanitize_input($input) {
    return htmlspecialchars(strip_tags(trim($input)));
}

// Function to validate email format
function validate_email($email) {
    return filter_var($email, FILTER_VALIDATE_EMAIL);
}

// Implementing the sanitize_input function
$user_input = "<script>alert('XSS attack!')</script>";
$sanitized_input = sanitize_input($user_input);
echo $sanitized_input;