title: Using PHP in $html = sting?
body: <p>I have the following code which displays currently a YouTube video via html embed code.</p>
  
  <pre><code> &lt;?php
  if ( function_exists( 'wpmudev_ppw_html' ) ) {
  $html = '&lt;iframe width="560" height="315" src="https://www.youtube.com/embed/-uiN9z5tqhg?wmode=transparent&amp;" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;'; // html code to be protected (required)
  $id = 1; // An optional unique id if you are using the function more than once on a single page
  $description = 'video'; // Optional description of the protected content
  $price = '1.50'; // Optional price for a single view. If not set, price set in the post will be applied. If that is not set either, Unit Price in the Global Settings will be used.
  echo wpmudev_ppw_html( $html, $id, $description, $price );
  }
  ?&gt;
  </code></pre>
  
  <p>I would like to remove the YouTube iFrame and have it display the following code instead. </p>
  
  <pre><code>&lt;img class="img-responsive img-thumbnail" src="&lt;?php the_field('macro_map'); ?&gt;" /&gt;
  </code></pre>
  
  <p>However, the PHP code in the $html= line causes a syntax error when done like so...</p>
  
  <pre><code>$html = '&lt;img class="img-responsive img-thumbnail" src="&lt;?php the_field('macro_map'); ?&gt;" /&gt;'; 
  </code></pre>
  
  <p>First, is it even possible for this to work. If so, what am I doing wrong?</p>