how to add decimals (.00) to a variable if it doesn't already have them?
<p>I have the following script that outputs a shipping amount number depending on what the user sets it to. The user should always set the number as "0.00" or "5.00" or "10.00" but I have some users who can't read, so they set it as "5" or as "10" without the decimals. In the output, I have it like:</p>

<pre><code>$output_box = $total['shipping'];
</code></pre>

<p>How do I change it so that it auto-detects if there's no decimals, and automatically adds ".00" to it?</p>

<p>For example, if the amount is "4" then it should change it to "4.00" but when the amount is "4.10" or "5.00" it should do nothing.</p>

<p>Any help is greatly appreciated :)</p>
