Page2Cat 2.5

I am using the Page2Cat plug in (https://www.ads-software.com/extend/plugins/page2cat/) and I am using the new feature to list the posts in each category. I’ve managed to make it look exactly like I want it, except I want the posts to display in date order, the oldest at the top and the newest at the bottom.

I can’t quite decipher how to do in the code for it:

// filter the content of a page, check for tag and replace it with a list of posts in the requested category.
// function heavily inspired from Alex Rabe NextGen Gallery's nggfunctions.php.
function page2cat_content_catlist($content){
global $post;
	if ( stristr( $content, '[catlist' )) {
		$search = "@(?:<p>)*\s*\[catlist\s*=\s*(\w+|^\+)\]\s*(?:</p>)*@i";
		if	(preg_match_all($search, $content, $matches)) {
			if (is_array($matches)) {
				$title = get_option('p2c_catlist_title');
				if($title != "") $output = "<p><h3>".$title."</h3>"; else $output = "";
				$output .= "<ul class='p2c_catlist'>";
				$limit = get_option('p2c_catlist_limit');
				foreach ($matches[1] as $key =>$v0) {
					$catposts = get_posts('category='.$v0."&numberposts=".$limit);
						foreach($catposts as $single):
						$output .= "<li><a href='".get_permalink($single->ID)."'>".$single->post_title."</a></li>";
						endforeach;
					$search = $matches[0][$key];
					$replace= $output;
					$content= str_replace ($search, $replace, $content);
				}
			$output .= "</ul></p>";
			}
		}
	}
return $content;
}

I’d rather not mess with it more than I already have. Thanks!