title: php string inside echo div tags
body: <p>I'm trying to add a return policy custom field just above the add to cart button in woocommerce. I've got the following function:</p>
  
  <pre><code>&lt;?php
  add_action( 'woocommerce_single_product_summary', 'return_policy', 20 );
  function return_policy() {
      echo '&lt;div id="return-policy-wrapper"&gt;
              &lt;?php the_cfc_field('rp-info-meta', 'rp-info-custom-filed'); ?&gt;
            &lt;/div&gt;';
  }
  </code></pre>
  
  <p>But the code validator points out there is an error somewhere in the string. I suspect the the error is with the single quote marks inside 
  <code>&lt;?php the_cfc_field('rp-info-meta', 'rp-info-custom-filed'); ?&gt;</code></p>
  
  <p>I changed the single quotes in that string for double quotes. Now the string validation error is gone, but the function won't work.</p>
  
  <p>Are they the single quotes that are causing the error and how can I fix it?</p>