title: Laravel5.5 can't Install Image/Intervention
body: <p>I just need some help I try to install image/intervention into my project, but got the problem message as the image below: 
  <img src="https://i.stack.imgur.com/mBmJn.png" alt="Problem1">
  Do I have to upgrade PHP VERSION to a higher one?</p>
  
  <p>I am really appreciated if you can help me solve this problem.</p>
  
  <p>Thank You
  Siripong </p>