Open Script Solution

  $sqllimit='SELECT email FROM '.TICKET_TABLE.'
             WHERE 30 >= TIMESTAMPDIFF(DAY,created,NOW()) 
             AND email='.db_input($var['email']).'';
  $reslimit=db_query($sqllimit);
  // Limit only 3 tickets sent within the last 30 days
  if (db_num_rows($reslimit) >= 3) {
      $errors['err'] = 'You are not allowed to send the ticket because you have already sent 3 tickets within the last 30 days!';
  }

  $sqllimit='SELECT email FROM '.TICKET_TABLE.'
             WHERE 30 >= TIMESTAMPDIFF(DAY,created,NOW()) 
             AND email='.db_input($var['email']).'';
  $reslimit=db_query($sqllimit);
  // Limit only 3 tickets in the last 30 days
  if (db_num_rows($reslimit) >= 3) {
    $email=$cfg->getDefaultEmail();
    if($email){
      $email->send($var['email'], 'Creating Ticket Denied', 'You are not allowed to send the ticket because you have already sent 3 ticket in the last 30 days!');
    }
    $errors['err'] = 'You are not allowed to send the ticket because you have already sent 3 ticket in the last 30 days!';
  }