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 ### Dependency Injector
 
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+A dependency injector resolves the dependencies of your class and makes sure that the correct objects are injected when the class is instantiated.
+
+My favorite injector is [Auryn](https://github.com/rdlowrey/Auryn), so install `rdlowrey/auryn` with composer or use one of the alternatives below:
+
+[Pimple](http://pimple.sensiolabs.org/), [Orno DI](https://github.com/orno/di), [PHP-DI](https://github.com/mnapoli/PHP-DI)
+
+to be continued...