title: Difference between two times (without date) in PHP
body: <p>I know there are a lot same kind problems but nothing do what I need.</p>
  
  <p>I have two times in the form of H.MM (3.25 - thats not 3:25, its 3:15) or HH.MM (22.75 - so its 22:45).</p>
  
  <p>I need to calculate the difference between starttime and endtime in hours. And i don't have date.</p>
  
  <p>My times are (so you can check):</p>
  
  <ol>
  <li>15.25 -> 23.75</li>
  <li>10.0 -> 22.0</li>
  <li>22.5 -> 8.0</li>
  <li>20.0 -> 10.0</li>
  <li>9.0 -> 17.0</li>
  <li>23.0 -> 6.0</li>
  </ol>
  
  <p>My head is on fire already.</p>
  
  <p>Thank you for helping.</p>