Modify Mod_rewrite rule to add article title to URL

I have searched SO but all the examples here are not working for me.

I have a $_SESSION['title']; //Session variable contains title from calling page

$title = $_SESSION['title']; //local variable contains article title

Let's say the title of the article is news-of-the-day How can I modify my rule to

http://www.newstoday.com/readnews/12/news-of-the-day

BTW http://www.newstoday.com/readnews/12 //this works

Rewrit开发者_如何学JAVAeEngine on
RewriteRule ^readnews/([0-9]+)$ readnews.php?news_art_id=$1

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Try something like that:

RewriteEngine on
RewriteRule ^readnews/([0-9]+)(/(.*))?$ readnews.php?news_art_id=$1&other_params=$3

Added later: everything what goes after id will be in other_params GET param.

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Your regex is incorrect. it should be:

RewriteEngine on
RewriteRule ^readnews/([0-9]+) readnews.php?news_art_id=$1

The $ indicates the end of the URL, but you want content after the id, you should remove it

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First of all, you need to make sure PHP is able to distinguish between the two URLs.

RewriteRule ^readnews/([0-9]+)(\/[a-z-]+)?$ readnews.php?news_art_id=$1&title=$2

This will make $_POST['title'] contain news-of-the-day if the title is present in the URL - otherwise $_POST['title'] will be empty. After this, you can simply check if it's set by PHP and redirect if not:

if (empty($_POST['title']))
  header("Location: /readnews/".$_POST['news_art_id']."/".$_SESSION['title']);