Retrieve content of a document in a snippet / Suggestion for the MODx API

$modx->getDocumentData(id)['content,title,longtitle,etc.'];

$modx->createDocument(parentid, properties, TV_values, content);

<?php
/* 
 * "GetDocData" by Blaise Bernier
 *
 * Snippet that returns some data from a given document
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
 * Params :
 *    &docID  -  ID of the document to retrieve
 *    &docData   -  Data to retrieve:
 *               0 : All (not implemented yet - will use placeholders to display the data)
 *               1 : Content (default)
 *               2 : Title
 *               3 : Long title               
 */
 
// Définir l'ID du document à récupérer
$docID = isset($docID) ? $docID : 1;

// Définir quelle(s) information(s) récupérer
$docData = isset($docData) ? $docData : 1;

// Définir dans quelle table chercher
$db_doc_table = $modx->getFullTableName("site_content");

// Définir quelle colonne retourner
$db_table_col = "";
switch ($docData) {
   case 0: break;
   case 1:
      $db_table_col = "content";
      break;
   case 2:
      $db_table_col = "pagetitle";
      break;
   case 3:
      $db_table_col = "longtitle";
      break;
}

// Effectuer la requête
$db_result = $modx->db->select($db_table_col, $db_doc_table, "id = $docID", "", "1");
$row = mysql_fetch_row($db_result);
$result = $row[0];

echo $result;
 
return;
?>

<div>
Document title : [*GetDocData?docID=`SomeID`&docData=`2`*]<br />
Content :<br />
[*GetDocData?docID=`SomeID`&docData=`1`*]