title: Get height and width from image in wordpress
body: <p>I'm trying to make an info block on my WordPress website I am working on. 
  I want to get the height X width of the photo:</p>
  
  <pre><code>get_the_post_thumbnail_url() 
  </code></pre>
  
  <p>I want it printed out on the page something like:</p>
  
  <pre><code>image size: 1234x123 1.2mb
  </code></pre>
  
  <p>I just don't know how to make it. I have tried a lot of different examples I found on the web but I always get different errors.</p>
  
  <p>Hope someone has an idea of a good way to do this. :)</p>