find out the fourth day from a n strtotime date in php
<p>I have a strtotime date in a variable. I need to find out the 4th day from that variable </p>

<pre><code>$strtotime1=strtotime('06/17/2012');
</code></pre>

<p>I need to find out the 4th day (i.e.  06/21/2012) in strtotime format. </p>

<p>I have tried with </p>

<pre><code>$strtotime2=$strtotime1+4*60 * 60;
</code></pre>

<p>But it's not working
Please reply</p>
