# February 2018

## Don’t use properties and methods from outside the interface

Don't use methods from outside the interface - featured image

It may sound obvious or even weird for people who programming in statically typed or compiled languages. In my work, I use PHP which is a dynamically typed language with optional strict typing introduced in version 7. At the beginning of my journey with PHP, I didn’t care so much about typing. I had a trivial cause — they didn’t exist yet.

I used to write a code without thinking about types. It was convenient and fast. Furthermore, it allowed writing proxy functions which recognize parameters type and it runs the proper function. Yes, overriding doesn’t exist in PHP.

But things changed when I discovered polymorphism. The magic keyword Interface that allows us to define the mandatory set of features in the object. The picture of writing a code without worrying about missing methods was incredible. I still didn’t understand one thing yet. How interfaces help me since I can pass everything on the function call?

This question lied a long time in my head until I discovered I can define the required type of passed object. Since that time, I changed completely the way how I write the code.