Make WordPress polyfills optional

README.md

@@ -59,6 +59,15 @@ You can also lock it in to a specific commit or tag:
 }
 ```
 
+If you are running the libraries in a non-WordPress environment, e.g. a PHPUnit test suite that
+tests your code without loading WordPress, you'll need to polyfill the WordPress APIs used by
+the php-toolkit libraries:
+
+```php
+require_once __DIR__ . '/vendor/autoload.php';
+polyfill_wordpress_apis();
+```
+
 For now, there is no way to cherry-pick just the one library you need. It's all or nothing.
 
 Note that the composer.json example above downloads more files than the required minimum, e.g. markdowns, unit tests, the `plugins` directory, etc. That's about 50MB of code in total and, most likely, it's not a big deal for your project. If you want a smaller package, the Data Liberation plugin referenced above ships a minified phar file that's about ~500KB compressed.

bootstrap.php

@@ -13,3 +13,5 @@
  */
 
 require_once __DIR__ . '/vendor/autoload.php';
+
+polyfill_wordpress_apis();