Should a php developer know popular CMS?

Question

CMS

The question arose, experienced php-programmers, how often did you use CMS for work? Or were they limited only to frameworks / self-written CMS?

Answer 1

It is impossible to know everything, and there will always be an employer/customer who needs you to know something else. Should not, I think, know everything. But you need to be able to quickly penetrate and make changes

Answer 2

In fact, in the business of a programmer, knowledge is a small part of success. It is important to be able to quickly understand new technologies, frameworks, CMS that are needed or for a specific project. Ability to solve emerging problems and overcome any technical difficulties.