Define('VARCHECK_FROM_POST', 0x02, True);
Define('VARCHECK_FROM_GET',  0x01, True);
Define('VARCHECK_MISSING',   0x00, True);

$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] = VARCHECK_FROM_POST;
  }
  ElseIf( IsSet($HTTP_GET_VARS[$search]) )
  {
    $locate[$iter] = VARCHECK_FROM_GET;
  }
  Else
  {
    $locate[$iter] = VARCHECK_MISSING;
  }

  Switch($locate[$iter])
  {
    Case VARCHECK_MISSING:
      $buffer = Null;
      Break;
    Case VARCHECK_FROM_GET:
      $buffer = $HTTP_GET_VARS[$search];
      Break;
    Case VARCHECK_FROM_POST:
      $buffer = $HTTP_POST_VARS[$search];
  }

  If( $buffer !== Null )
  {
    If( Get_Magic_Quotes_Gpc() == True )
    {
      $buffer = StripSlashes($buffer);
    }

    $buffer = HTMLSpecialChars($buffer);

    $alias = $aliases[$iter];
    
    $code = "\$".$alias." = \$buffer;";
    Eval($code);
  }

  UnSet($search);
  UnSet($buffer);
  UnSet($alias);
  UnSet($code);
}

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