Are there any best practices for handling age verification popups on websites using PHP?

When handling age verification popups on websites using PHP, it is important to ensure that the verification process is secure and compliant with legal regulations. One best practice is to store the user's age verification status in a session variable after successful verification, so that they do not have to verify their age again during their session on the website.

// Check if age verification has already been completed
session_start();

if(isset($_SESSION['age_verified']) && $_SESSION['age_verified'] === true){
    // User has already verified their age, proceed with website content
} else {
    // Display age verification popup and process verification
    // Once age is verified, set session variable
    $_SESSION['age_verified'] = true;
}