Placeholders and parsing chunks

[+pagetitle+]
[+content+]
[+firsttemplatevariable+]

<?php
//some variables for the template names.. 
$mainchunkname = "myOuterChunkTpl";
$rowchunkname = "myChunkTpl";
// your sql or what ever gets your data into an array
$sql = "SELECT * FROM ....";
$rs=$modx->db->query($sql);
$chunkrows="";
// go trough the array
while($row=$modx->fetchRow($rs)) {
   //get the chunk and parse it for this row
   $chunk = $modx->getChunk($rowchunkname);
   $chunkrows .= str_replace('[+firstname+]', $row['firstname'], $chunk);
   $chunkrows .= str_replace('[+lastname+]', $row['lastname'], $chunk);
}
// just another example to merge the rows in to some outer template
$chunk = $modx->getChunk($mainchunkname);
$output = str_replace('[+myrows+]', $chunkrows, $chunk);
// return the output to MODx
return $output;
?>

$chunkrows .= str_replace('[+firstname+]', $row['firstname'], $chunk);

<?php //

	function renderHtml($chunkHTML,$htmlTpl){
    global $modx;
        if(!is_array($chunkHTML)){
        
        return "ca coince";
        
        }else{  
        
        $replace= array ();
        $matches= array ();
//find the placeholders in the chunk 
        if (preg_match_all('~\[\+(.*?)\+\]~', $htmlTpl, $matches)) {
            $cnt= count($matches[1]);            
            $v = $chunkHTML ;
            
            for ($i= 0; $i < $cnt; $i++) {                
                 $key= $matches[1][$i];
                 $replace[$i]= $v[$key];
            }
            $html = str_replace($matches[0],$replace, $htmlTpl);
           
           return $html;      
        }
        return $htmlTpl;
        }
          
    }

<?php 

$htmlTpl = $modx->getChunk($rowchunkname);

while($row=$modx->fetchRow($rs)) {
   //get the chunk and parse it for this row
   $chunkHTML ['firstname'] = $row['firstname'];
   $chunkHTML ['lastname'] =  $row['lastname'];
}

$output = renderHtml($chunkHTML,$htmlTpl);

$modx->parseChunk('myTpl', $modx->placeholders, '[+', '+]');

while($row=$modx->fetchRow($rs)) {
   $output .= $modx->parseChunk('myTpl', $modx->placeholders, '[+', '+]');
}