Many bloggers use Feedburner to display the number of their subscribers. If you want to be able to show the average number of them over the past 7 days, here is the code that is useful for this purpose.
As usual, first of all you need to insert this function into the functions.php file of your theme:
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function get_average_readers($feed_id,$interval = 7){
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$today = date('Y-m-d', strtotime("now"));
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$ago = date('Y-m-d', strtotime("-&#...