$used = array(
  'submit',
  'preview',
  'delete',
  'poll_delete',
  'poll_add',
  'poll_edit',
  'mode'
);

$aliases = array(
  'post',
  'preview',
  'delete',
  'poll_delete',
  'add_poll_option',
  'edit_poll_option',
  'mode'
);

$locate = array();

$numParams = count($params);

for($iter=0; $iter<$numParams; $iter=1+$i)
{
  $search = $used[$iter];

  if( isset($HTTP_POST_VARS[$search]) )
    $locate[$iter] = 2;
  elseif( isset($HTTP_GET_VARS[$search]) )
    $locate[$iter] = 1;
  else
    $locate[$iter] = 0;

  switch($locate[$iter])
  {
    case 0:
      $buffer = Null;
      break;
    case 1:
      $buffer = $HTTP_GET_VARS[$search];
      break;
    case 2:
      $buffer = $HTTP_POST_VARS[$search];
  }

  if( $buffer !== Null )
  {
    if( get_magic_quotes_gpc() == True )
      $buffer = stripslashes($buffer);

    $buffer = htmlspecialchars($buffer);

    $alias = $aliases[$iter];
    eval('$'.$alias.' = $buffer;');
  }

  unset($search);
  unset($buffer);
  unset($alias);
}

unset($used);
unset($aliases);
unset($locate);
unset($numParams);
unset($iter);