How do I get the email address of the current loged in user?

I created a snippet with the following code but I dont get the email address.

<?php
$userID = $modx->getLoginUserID();
$table = $modx->getFullTableName("web_user_attributes");
$userEmail = $modx->db->select("email" ,$table, "id = $userID", "", "");
echo $userID;
echo "
";
echo $userEmail;
?>

This returns the following:

1
Resource id #14

Where am i going wrong?

Thanks
davehaslam@davehaslam.co.uk

<?php
print_r($_SESSION[’webEmail’]);
?>