As I’ve mentioned here before, for Planet Atheism I’m using moonmoon, mostly because 1) everyone else uses planetplanet, and 2) it’s in PHP instead of Python, and I know a little PHP. 
moonmoon is still on version 0.2, however, and, while it removes “dangerous” tags from feeds automatically, it doesn’t (yet?) deal with unclosed tags. As most of PA’s members are as far from being geeks as possible, they tend to use WYSIWYG editors, and aren’t really worried about “validating HTML”. So, from time to time, a post would make every other post after it show in bold or italic. Annoying, to say the least.
Yesterday, it was even worse: some posts “spilled over” to the sidebar. And it wasn’t just one post causing it, but two, from different blogs, at the same time!
Well, enough was enough.
“Fixing” moonmoon (or, more precisely, SimplePie) was out of the question; I simply don’t know enough PHP / XML parsing to do it. But I tried something else: I saved the generated HTML to a file on the site’s directory, and used tidy on it. Surprise: this new version was perfect! So, I got the idea of using tidy on the generated HTML every time.
Now, PHP has a tidy module, but in PHP5 I would have to compile PHP by hand. Ubuntu doesn’t have a package for that module, unfortunately, and I really didn’t want to make an exception from using apt packages on that server. So, I had to find another way.
My solution was to dump all the page into a buffer (using the ob_ functions in PHP), save it to a temporary file, use the system command to apply tidy on it, load the altered file, and show it to the browser. It’s probably not very efficient, but it works… better than I expected, too. It may be a crude solution, but I’m proud of it anyway. 
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