I wanted to pass a parameter or variable directly to a chunk in MODx 0.9.6

Apparently this is only possible in the REVO version of MODx. So Instead I needed to create a snippet to call the chunk and pass the parameter as a placeholder. Rather than doing it for this for a single purpose, I made it so any parameter name can be passed, allowing for a bit more flexibility.

/*
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 Snippet name: PassParameter
 Short Desc: passes a parameter to a chunk as a placeholder
 Date: May 29, 2009
 Author: Daniel Poda
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Description:
    pass parameter defined by &pName and &pVal to a chunk &tpl
    set &preparse to 1 (TRUE) to parse the chunk before returning the content
    by default this does not pre parse
::::::::::::::::::::::::::::::::::::::::
Usage:
    [[PassParameter? &tpl=`myChunk` &pName='param' &pVal='12' &preparse='1']]
*/

   $params[$pName]=$pVal;

   if ($preparse== 1){
      $documentOutput.=$modx->parseDocumentSource($modx->parseChunk($tpl, $params, '[+', '+]'));
   }
   else{
      $documentOutput.=$modx->parseChunk($tpl, $params, '[+', '+]');
   }

   echo($documentOutput);
?>

usage
[[PassParameter? &tpl=`myChunk` &pName='param' &pVal='12' &preparse='1']]