title: Add 7 days to PHP date and change format at once
body: <p>I have a date being echoed in my code like so.</p>
  
  <pre><code>date("F j", strtotime($dateEnd))
  </code></pre>
  
  <p>I want to change it to do something like...</p>
  
  <pre><code>date("+7 day", "F j", strtotime($dateEnd))
  </code></pre>
  
  <p>But adding the +7 day stops it from working, but in other situations adding days that way has worked. Is it possible to change the format to "F j" and add 7 days at once?</p>