Re: Class Extension

> There is no such check in PHP. Static Analysis tools may warn about it, but a trait will > compile fine with code that refers to unknown members. The code will then succeed or fail at runtime > just like any other object access: I have to admit I never knew that worked. I genuinely learned something new today. Now knowing that, it makes the case for using a different keyword like extension much stronger since that is not the case for an extension. Everything on an extension is type-checked at compile time, save some edge cases with scalars.