Создание поиска по TV (с нуля)

<?php
if ( isset($_POST['go']) ) 
{
$par = $_POST['par'];
			
$sql = $modx->db->select("contentid", "modx_site_tmplvar_contentvalues", "value = $par", "", "");
while( $row = $modx->db->getRow( $sql )) 
	{ $output .= '<p> Doc_ID: <a href=[~' .$row['contentid']. '~]>'.$row['contentid'].'</a></p>'; } 
echo $output;
}
?>

<?php	//	tvset	//
	
$txt = $modx->getTemplateVar('par');
$mass = explode ("||", $txt['elements']);
 
foreach ($mass as $key => $value) { 
	$out_par .= "<option value=\"$value\">$value</option>"; } 
	$modx -> setPlaceholder ('out_par',$out_par) ;	

?>
	--- чанк ---
  <form method="POST" action="">
<table style="width:260px;">
    <tr valign="top">
      <td align="right">Тип</td>
      <td>
          <select name="par">
          [+out_par+]
          </select>
      </td>
    </tr>
</table>
  <br>
  <input type="submit" name="go" id="go" value="Поиск">
  </form>

$sql = $modx->db->select("contentid", "modx_site_tmplvar_contentvalues", "value = $par", "", "");
while( $row = $modx->db->getRow( $sql )) 
	{ $output .= '<p> Doc_ID: <a href=[~' .$row['contentid']. '~]>'.$row['contentid'].'</a></p>'; }

$result = "SELECT `contentid` FROM `modx_site_tmplvar_contentvalues` WHERE `value` = '$par'";
$sql = $modx->db->query($result);
while ($myrow = mysql_fetch_row($sql)) {
	$output .= "<p>Doc_ID: <a href=\"$myrow[0]\">$myrow[0]</a></p>\n";
}