Get "rounded numbers" by a round function
<p>Is there a way in PHP to get what the <code>round</code> function has rounded.</p>

<p>I mean, let's assume I have</p>

<pre><code>$totalRows = 54;
$v = round($totalRows, -1);

print $v // prints 50
</code></pre>

<p>This is fine but I was wondering if there were a way to get the number 4 which has been removed rounding <code>$totalRows</code>.
I'm aware that this might have little to do with the <code>round()</code> function but it is just an example of what I'm trying to achieve</p>