WordPress and MySQL: trying to print data using PHP from user_meta custom field data

That’s a serialized object variable. The numbers are string lengths, for example, where you see s:8:"duration", notice that the word ‘duration’ is 8 characters long. You shouldn’t have to worry about that, because WordPress will take care of it for you.

You can access the fields like so:

global $user_ID;

// Get the 'paypal_user' info for the user. Just fetch a single
// value, not an array.
$paypal_user = get_user_meta($user_ID, 'paypal_user', true);
$exp_date = $paypal_user->expire_date;
$paytype = $paypal_user->payment_type;