title: open html file in php email
body: <p>I currently have this code trying to open html file and set that to $mail_body.</p>
  
  <pre><code>include_('../forms/promo_email_form.html');
  
          $mail_body = '';
  
  
          $headers  = 'MIME-Version: 1.0' . "\r\n";
          $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
          $headers .= "From: info@grillontherock\r\n";
  </code></pre>
  
  <p>I've seen people just putting regular html file into $mail_body but I have massive html file which I cannot and easier for me to use.</p>
  
  <p>Can you guys give exmaple code? Thanks!</p>