How do I show number of days between 2 dates

This script is for backorders on my online store.

Today's Date minus Order Date = number of days

$date=date("m/d/y") - $orderdate
03/12/15 - 02/12/15 = 30

I have tried several different things and cannot get number of days returned.
lawrence_devAsked:
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Phil PhillipsDirector of DevOps & Quality AssuranceCommented:
Something like:

<?php
$date1 = new DateTime();
$date2 = new DateTime($orderdate);

$diff = $date2->diff($date1)->format("%a");
echo $diff;
?>

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