title: PHP Check if the current time is less than a specific time
body: <p>Let's say I got this time <code>21:07:35</code> now and this time into a variable <code>21:02:37</code> like this</p>
  
  <pre><code>&lt;?php
  $current_time = "21:07:35";
  $passed_time = "21:02:37";
  ?&gt;
  </code></pre>
  
  <p>Now I want check if <code>$current_time</code> is less than <code>5 minutes</code> then echo <code>You are online</code>
  So how can I do this in PHP? <br>
  Thanks<br>
  :)</p>