The setup
When a new article is written, wordpress will update the blog RSS and this feed always contains the latest contents of your blog. For this blog, that’s davidtan.org/feeds.
Some people uses feedburner to publish and track where their feeds are viewed, clicked and consumed. Plus, there’s also a setting in feedburner that will sync new posts to your twitter account as well (ex. @davidtanth). You can also subscribe to your blog’s feed in Google Reader to keep track of your own blogs.
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Redirecting traffic from one URL to another is a common task among webmaster. It’s usually done so when old pages are renamed/moved and you want to redirect people to the new page instead of letting them get a 404 no page found error. Affiliate marketers also do this intentionally to cloak their links and redirect users to the real link which hold their tracking id or affiliate credentials.
I found the EXEC PHP wordpress plguin while trying to figure out how to execute PHP code inside a wordpress post and page. It works, but do note that you’ll need to make a few settings changes so that your php code will be recognized as php tags and executed.