title: PHP: $_GET image location for Facebook Open Graph
body: <p>Is it possible to get the location of an image that is on a webpage?
  I want to use it for <code>og:image</code>.</p>
  
  <p>example:</p>
  
  <pre><code>&lt;meta property="og:image" content="&lt;?php 'get the image location' ?&gt;" /&gt;
  </code></pre>
  
  <p>It is for a Open Graph Facebook share.</p>