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If you have a project for a client or perhaps just for yourself, you may find that you need to upload a file in the WordPress back-end that is not supported by the core application.

Depending on the type of file that you want to introduce, you may need to add support for additional MIME types. Luckily, this is easy enough to do.

No, not that type of mime.

But before looking at the code for how to do it, I think it’s important to understand exactly what we’re adding (otherwise, we run the risk of copying and pasting code and not knowing what it is or what it does other than it works).

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GPL attribution is one of those tangential topics to a lot of the GPL discussion around WordPress (which I’m not interested in discussing here).

Instead, what I’m trying to answer is this:

How do you give proper GPL attribution when using someone else’s work in your work?

Case in point: Let’s say someone is building a theme and wants to bundle some code you’ve written (and it’s available on GitHub) and is trying to attribute it properly to you?

First, this is something that someone was kind enough to ask me when working on a project of his own. Second, I think it’s a great question as it’s something we should all know how to answer since much of our work is likely using other third-party, open source libraries.

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Custom Post Types are arguably the feature that brought WordPress from being a standard blogging application up to a CMS. I’d even go as far to say that this feature also added new APIs for developers to use when building web applications.

Here’s a post, but this isn’t exactly representative of a custom post type.

Though posts, pages, and basically anything that as a title and the editor (among other optional features) are post types, custom post types are what allow us to actually create a model of information to store in the database, associated with metadata, and more.

The point of this post isn’t about how great custom post types are, though. Instead. it’s about how to handle the case whenever you receive the following message:

Fatal error: Call to a member function add_rewrite_tag() on a non-object

Fatal error? That’s never good. The nice thing is that this isn’t really terribly difficult to fix.

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