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<?php
//When title has the following format: '1.1. Title'. Edit preg_match expressions as needed
function sort_titles_numeric($a,$b) {
	$akey = $a->post_title;
	if (preg_match('/^(\d+)\.(\d+)\. /',$akey,$matches)) {
		$akey = sprintf('%010d ',$matches[0]) . $akey;
	}
	$bkey = $b->post_title;
	if (preg_match('/^(\d+)\.(\d+)\. /',$bkey,$matches)) {
		$bkey = sprintf('%010d ',$matches[0]) . $bkey;
	}
	if ($akey == $bkey) {
		return 0;
	}
	return ($akey < $bkey) ? -1 : 1;
}
//uasort($posts,'sort_titles_numeric');
?>

//Sort title by article numbers - 'Article 23. ...'
	function sort_titles_article_numbers($a,$b) {
		$akey = $a->post_title;
		if (preg_match('/^Article (\d+)\. /', $akey, $matches)) {
			$akey = $matches[1];
		}
		$bkey = $b->post_title;
		if (preg_match('/^Article (\d+)\. /', $bkey, $matches)) {
			$bkey = $matches[1];
		}
		if ($akey == $bkey) {
			return 0;
		}
		return ($akey < $bkey) ? -1 : 1;
	}
	//uasort($posts,'sort_titles_article_numbers');