Paul shares some of the WordPress utility functions he's collected and uses often.
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Here are some commonly unknown WordPress functions I’ve come across when developing with WordPress. A few little gems that I wish I discovered long before I needed them.
Alex Mansfield has published a very comprehensive overview of creating custom meta boxes in WordPress. It doesn’t cover every type of field, but if you aren’t using a class or other tool for building metaboxes, this will come in very handy. You may remember Alex’s previous guide to the theme customizer, too.
Eric Mann describes why you shouldn’t dequeue WordPress’ version of jQuery. Unless you have a really, really good reason to use a CDN for jQuery (you probably don’t), then stick with what WordPress ships with. You’ll likely save yourself many headaches. Eric does a nice job explaining why in detail.
WordPress 3.6 introduced the Heartbeat API. It’s an exciting API that opens up a whole bunch of possibilities for various core features or plugins, or even themes, to utilize. Pippin Williamson gives a nice introduction and example use case for the Heartbeat API, and Stephen Harris has also completed a three part series for wpTuts+…
Here’s a very simple question to a potentially confusing problem relating to how WordPress relates ID’s, slugs, and tags when dealing with URLs.