Drupal 7 Services List and Entity Reference Field Issues

I've been working on an angularjs project that features a Drupal services backend. As I'm new to angular (or was), I thought I had to have been doing something wrong posting data back to Drupal to save my user accounts. The response from the services backend would be a 406, with the messages:

406 (Not Acceptable : An illegal choice has been detected. Please contact the site administrator.)

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Drupal 7 Services Example - PHP Curl

I had a need to consume a custom service I created in Drupal services. There's loads of tutorials on how to do that, feel free to google. But my previous code for using the api I created was for D6, a few things have changed. Looking around I found most examples were javascript, or using drupal's http library. I wrote a tiny little object just as a simple way to consume using curl for reference. It's not complete, but it lets you log in and out. You can take it from there to build what you need.

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PHP Country Code ISO3 to ISO2 Mapping Array

Needed this for one my projects. Finding an ISO code 2 php array was immediate, but no one seems to have a 3 to 2 code mapping. Posting just to make people's googling more pleasant.

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Caching Drupal Renderable Arrays

Love getting to learn something new. Going through some tutorials today, I realized there's an 'easy' hook to enable caching of the renderable arrays I never knew about. What exactly is a renderable array? ... Maybe the easiest way you can think of it is structured data that needs to be transformed into html. Previously I'd been using cache_set and cache_get, but this is quicker, and a bit more flexible.

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