- phpunit docs (phpunit.readthedocs.io)
- GuzzleHttp docs (guzzlephp.org)
PHP Magic Methods
General list of “magic methods”: http://php.net/manual/en/language.oop5.magic.php
Turn “hidden” fields into proper properties with getters and setters:
http://php.net/manual/en/language.oop5.overloading.php