How do I process a document

$docID = $yourDocIDHere;

$doc = $modx->getDocument((string)$docID, '*', 1); // Search published first.

if (empty($doc)) {
    $doc = $modx->getDocument((string)$docID, '*', 0); // Un-published next?
}

if (empty($doc)) { // requested a non-existing document
   return $faq_lang['ezfaq-doc-not-found'];
}

$docString = $doc['content'];

$docArray = explode($delimiter,$docString)
;
foreach($docArray as $value) {
     // do your thing here
}

parseDocumentSource($source);

//or any of the below
            // combine template and document variables
            $source= $this->mergeDocumentContent($source);
            // replace HTMLSnippets in document
            $source= $this->mergeChunkContent($source);
            // find and merge snippets
            $source= $this->evalSnippets($source);
            // find and replace Placeholders (must be parsed last) - Added by Raymond
            $source= $this->mergePlaceholderContent($source);

$doc_ids = '1,2,3'; //example doc_ids. real input comes from TV values

function mergeDocumentContentX($doc_id) {
		global $modx;
		
		$my_doc = $modx->getTemplateVarOutput('*',$doc_id);
		$template = $my_doc['content'];
		
		//return $template;
		$replace= array ();
		preg_match_all('~\[\*(.*?)\*\]~', $template, $matches);
		$variableCount= count($matches[1]);
		$basepath= $modx->config["base_path"] . "manager/includes";
		for ($i= 0; $i < $variableCount; $i++) {
				$key= $matches[1][$i];
				$key= substr($key, 0, 1) == '#' ? substr($key, 1) : $key; // remove # for QuickEdit format
				$value = $my_doc[$key];
				if (is_array($value)) {
						include_once $basepath . "/tmplvars.format.inc.php";
						include_once $basepath . "/tmplvars.commands.inc.php";
						$w= "100%";
						$h= "300";
						$value= $modx->getTVDisplayFormat($value[0], $value[1], $value[2], $value[3], $value[4]);
				}
				$replace[$i]= $value;
		}
		$template= str_replace($matches[0], $replace, $template);

		return $template;
}

foreach ($doc_ids as $sb_documents)
{
	$output .= mergeDocumentContentX($sb_documents);
}

echo $output;

[+sidebar.left+] or [+rnStrName+]

<?php
//File assets/snippets/testing/sidebarParser.inc.php
global $modx;

//You can use these values as example
$ar_sidebar = '1,2,3';

//$ar_sidebar = split(',',$chunks);
//$ar_sidebar = array_unique($ar_sidebar);

$ar_sb_exclude = split(',',$excludeDocs);
$ar_sb_exclude = array_unique($ar_sb_exclude);

setPlaceholders($ar_sidebar);


function setPlaceholders($doc_ids) {
		global $modx;

		$placeholders_array = getContentX($doc_ids);

		foreach ($placeholders_array as $key => $value) {
			//echo "<br/>Value: $value<br/><br/>";
			$placeholder_name = 'sidebar.'.$key;

			$modx->setPlaceholder($placeholder_name,$value);
			echo "<br/>Key: $key<br/>";
			echo "Placeholder Name: $placeholder_name<br/><br/>";
		}

}

/*	run mergeDocumentX, merge [content]	with styling, and position. Create array for setPlaceholders		*/
function getContentX($array)
{
	foreach ($array as $doc_id)
	{
		$my_wrapper = "\n<div class='{STYLING}'>\n\t<div><div><div>\n\t\t{CONTENT}\n\t</div></div></div>\n</div>\n";
		$output     = mergeDocumentContentX($doc_id);
		$template  	= $output[template];

		//These are two TVs, I've setup
		//You can use
		$sidebar_placement = 'left';
		$sidebar_styling   = 'left_side';
		//$sidebar_placement = $output[my_doc][sidebar_placement];
		//$sidebar_styling   = $output[my_doc][sidebar_styling];

		$my_wrapper = str_replace('{STYLING}', $sidebar_styling, $my_wrapper);
		$template   = str_replace('{CONTENT}', $template, $my_wrapper);

		$my_placements[$sidebar_placement] .= $template;

		//print_d($template);

	}

	return $my_placements;
}

/*	Parse all TVs in the [content] of a document. $doc_id is the id of the document	*/
function mergeDocumentContentX($doc_id) {
		global $modx;

		$my_doc = $modx->getTemplateVarOutput('*',$doc_id);
		$template = $my_doc['content'];

		$replace= array ();
		preg_match_all('~\[\*(.*?)\*\]~', $template, $matches);
		$variableCount= count($matches[1]);
		$basepath= $modx->config["base_path"] . "manager/includes";
		for ($i= 0; $i < $variableCount; $i++) {
				$key= $matches[1][$i];
				$key= substr($key, 0, 1) == '#' ? substr($key, 1) : $key; // remove # for QuickEdit format
				$value = $my_doc[$key];
				if (is_array($value)) {
						include_once $basepath . "/tmplvars.format.inc.php";
						include_once $basepath . "/tmplvars.commands.inc.php";
						$w= "100%";
						$h= "300";
						$value= $modx->getTVDisplayFormat($value[0], $value[1], $value[2], $value[3], $value[4]);
				}
				$replace[$i]= $value;
		}
		$template= str_replace($matches[0], $replace, $template);
		//return $template;

		$return_vals = array("my_doc" => $my_doc, "template" => $template);
		return $return_vals;
}


function print_d($array){
	echo "<pre>PRE<br/>\n";
	print_r($array);
	echo "</pre>\n";
}

?>

<?php
//Snippet
//tried this but its not setting either
$modx->setPlaceholder('rnStrName', 'T E S T I N G');

$snipPath = $modx->config['base_path'] . "assets/snippets/testing/";
include_once $snipPath."sidebarParser.inc.php";

?>