So you wouldn't do it from inside Oracle within a PL/SQL-Package working as a daemon (would run once a day for two hours - I hope)?.
I personally wouldn't do it that way, but you could do it that way if you really wanted to. It's not the ideal way to do this kind of thing, however.
I suppose because of missing Oracle functions handling internet content?
But it would work with HTP, URI...packages?
The reason I wouldn't do it that way is because it's inefficient and it's the wrong tool for the job, in my opinion. Oracle is a database; let the database do what it's good at and use other tools or languages to do all the other stuff. Let the database do the heavy lifting where it excels, and don't waste its time or resources doing stuff it's not suited for. Oracle is a great database, but it's not the best tool to do text processing, remote content retrieval, or inline data reformatting. That's where I'd use something like PHP.
On the other side, with PHP + AppServer I would have another two instances to be maintained. And a problem, I don't speak PHP yet.
In general, PHP doesn't require any ongoing maintenance once it''s installed. It just runs.
A number of people here are fairly proficient in PHP, so feel free to ask for help if you need it. We may also be able to come up with some sample code for you if you can give us an idea of what you want to do.