if ( (empty($subject))  &&  (empty($text)) ) {
    echo "Both of these fields are empty."; }
  if ((empty($subject) ) && (!empty($text)) ) {
      echo "subject was forgotten.";
    }
  if  ((empty($text)) && (!empty($subject)) ) {
          echo "you forgot the body.";
                                        }
if ((!empty($subject)) && ( (!empty($text))) {
          echo "send the e-mail.";
          $dbc = mysqli_connect('localhost', 'student', 'student', 'elvis_store')
            or die('Error connecting to MySQL server.');

          $query = "SELECT * FROM email_list";
          $result = mysqli_query($dbc, $query)
            or die('Error querying database.');

          while ($row = mysqli_fetch_array($result)){
            $to = $row['email'];
            $first_name = $row['first_name'];
            $last_name = $row['last_name'];
            $msg = "Dear $first_name $last_name,\n$text";
            mail($to, $subject, $msg, 'From:' . $from);
            echo 'Email sent to: ' . $to . '<br />';
            }