How can a time system be implemented in PHP to automatically set a premium feature for a certain duration, such as 30 days?

To implement a time system in PHP to automatically set a premium feature for a certain duration, such as 30 days, you can use the PHP `strtotime` function to calculate the end date based on the current date. You can then compare the current date with the end date to determine if the premium feature should be active or not.

// Calculate the end date for the premium feature (30 days from now)
$endDate = date('Y-m-d H:i:s', strtotime('+30 days'));

// Check if the current date is before the end date to determine if the premium feature is active
if (time() < strtotime($endDate)) {
    // Premium feature is active
    echo "Premium feature is active until $endDate";
} else {
    // Premium feature has expired
    echo "Premium feature has expired";
}