title: Constructing shell command including php variables
body: <p>When this shell_exec command runs within my function, only the first url parameter is passed to the receiving php file. I suspect I am not constructing the command correctly.</p>
  
  <pre><code>shell_exec("curl https://inklines.art/process_emails.php?url=" . $full_site_url . "&amp;domain=" . $domain . "&amp;site=" . $site_title . "&amp;title=" . $title . "&amp;permalink=" . $permalink);
  </code></pre>
  
  <p>How should the command be constructed to pass all the variables?</p>
  
  <p>Thanks much!</p>