read all files from a directory

<?php
/*
::::::::::::::::::::::::::::::::::::::::
 Snippet name: ParseImages
 
Description:
    parses images in &folder in chunk &tpl
::::::::::::::::::::::::::::::::::::::::
Usage:
    [!ParseImages? &tpl=`myChunk_tpl` &folder='assets/images/folder'!]
*/
	//	$folder;
	//	$tpl;
	$output = "";
	$filesArray = Array();
	
	$imgDir = opendir ($folder);

	while ( $file = readdir( $imgDir ) )
	{	
		//checks that file is an image
		$file_type = strrchr( $file, "." );
		$is_image = eregi( "jpg|gif|png",$file_type );
		
		if ( $file != '.' && $file != '..' && $is_image )
		{
			array_push($filesArray,$file);
		}
	}
	
	rsort($filesArray);
	
	foreach ($filesArray as &$fn) {
	
		// set the placeholder 
		$params['image']=$modx->config['site_url'].$folder.$fn;
		$params['imagefilename']=$fn;
		
		// Parse the chunk
		$output .= $modx->parseDocumentSource($modx->parseChunk($tpl, $params, '[+', '+]'));
	}
	closedir ($imgDir);

	return $output;
?>

$output .= $modx->parseDocumentSource($modx->parseChunk($tpl, $params, '[+', '+]'));

$output .= $modx->parseChunk($tpl, $params, '[+', '+]');