Красивые ЧПУ с помощью mod_rewrite и rewrite.php - SEF (ЧПУ)

RewriteEngine on
RewriteCond %{HTTP_HOST} ^mysite\.com
RewriteRule ^(.*)$ http://www.mysite.com/$1 [R=permanent,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php [L]

<?php
$pdo=new PDO('mysql:dbname=your_dbname;host=your_host','name_db','pass_db');
if(isset($_GET['page']) && $_GET['page']=='shop.product_details')
{
	if($url=$pdo->query('SELECT url FROM sema_sef WHERE id='.$pdo->quote($_GET['product_id']).' AND cat>0')->fetchColumn())
	{
		echo "/".$url;
		header("HTTP/1.1 301 Moved Permanently");
		header("Location: /".$url);
		die();
	}
}
elseif(isset($_GET['page']) && $_GET['page']=='shop.browse')
{
	if(isset($_GET['category_id']))
	{
		if($url=$pdo->query('SELECT url FROM sema_sef WHERE id='.$pdo->quote($_GET['category_id']).' AND cat=0')->fetchColumn())
		{
			$add=array();
			if(isset($_GET['limit']))
				$add[]='limit='.$_GET['limit'];
			if(isset($_GET['limit']))
				$add[]='limitstart='.$_GET['limitstart'];
			if(isset($_GET['orderby']))
				$add[]='orderby='.$_GET['orderby'];
			if(isset($_GET['DescOrderBy']))
				$add[]='DescOrderBy='.$_GET['DescOrderBy'];
			if($add==array())
				$add='';
			else
				$add='?'.implode('&',$add);
			//echo "/".$url.$add;
			header("HTTP/1.1 301 Moved Permanently");
			header("Location: /".$url.$add);
			die();
		}
	}
	elseif(isset($_GET['manufacturer_id']))
	{
		if($url=$pdo->query('SELECT url FROM sema_sef WHERE id='.$pdo->quote($_GET['manufacturer_id']).' AND cat=-1')->fetchColumn())
		{
			$add=array();
			if(isset($_GET['limit']))
				$add[]='limit='.$_GET['limit'];
			if(isset($_GET['limit']))
				$add[]='limitstart='.$_GET['limitstart'];
			if(isset($_GET['orderby']))
				$add[]='orderby='.$_GET['orderby'];
			if(isset($_GET['DescOrderBy']))
				$add[]='DescOrderBy='.$_GET['DescOrderBy'];
			if($add==array())
				$add='';
			else
				$add='?'.implode('&',$add);
			//echo "/".$url.$add;
			header("HTTP/1.1 301 Moved Permanently");
			header("Location: /".$url.$add);
			die();
		}
	}
}
else
{
	if($fin=strpos($_SERVER['REQUEST_URI'],'?'))
		$sru=substr($_SERVER['REQUEST_URI'],1,$fin-1);
	else
		$sru=substr($_SERVER['REQUEST_URI'],1);
	if($res=$pdo->query('SELECT id,cat FROM sema_sef WHERE url='.$pdo->quote($sru))->fetch(PDO::FETCH_ASSOC))
	{
		//category
		if($res['cat']==0)
		{
			$_GET['page']='shop.browse';
			$_GET['category_id']=$res['id'];

		}
		elseif($res['cat']==-1)
		{
			$_GET['page']='shop.browse';
			$_GET['manufacturer_id']=$res['id'];
		}
		else
		{
			$_GET['page']='shop.product_details';
			$_GET['category_id']=$res['cat'];
			$_GET['product_id']=$res['id'];
			//$_GET['flypage']='flypage-images.tpl';
			$_REQUEST['product_id']=$_GET['product_id'];
			//$_REQUEST['flypage']=$_GET['flypage'];
		}
		$_GET['Itemid']='4';
		$_REQUEST['Itemid']=$_GET['Itemid'];
		$_GET['option']='com_virtuemart';
		$_REQUEST['option']=$_GET['option'];
		$_REQUEST['page']=$_GET['page'];
		$_REQUEST['category_id']=$_GET['category_id'];
		$tmp=array();
		foreach($_GET as $k=>$v)
		{
			$tmp[]="$k=$v";
		}
		$_SERVER['REQUEST_URI']='/index.php?'.implode("&",$tmp);
	}

	//print_r($_GET);
	//print_r($_SERVER['REQUEST_URI']);
	}
//}