After the post Fetching RSS Feed and Outputing Feed Items as HTML in PHP was originally published, there are some updates such as adding a simple RSS feed caching mechanism and supporting scanning
content parts of the feed items for images. Recently, Webucator makes a great tutorial video on introducing the RSS to HTML PHP function. Here is the video that teaches how to use the PHP function.
Thanks to Webucator for producing this tutorial video. They provide nice free PHP tutorials. Remember to check these tutorials out.