HTACCESS file with URL Rewrite

.htaccess

Options +FollowSymlinks
RewriteEngine on
RewriteRule ^post/([0-9]+)(:?\/[a-zA-Z0-9_]*)?(:?\/.*)?$ /index.php?id=$1
RewriteRule ^post/([a-zA-Z]+)/([0-9]+)(:?\/[a-zA-Z0-9_]*)?(:?\/.*)?$ /index.php?filter=$1&value=$2

title_to_url.php

<?php
// Parses the title string to make it url/seo friendly
// Returns thed scrubbed string
function parseTitle($str) {
	$str = preg_replace("/[^a-zA-Z0-9_\s]+/i", '', $str);
	$str = preg_replace("/\s+/i", '_', $str);
	return $str;
}
?>