At what level does a developer (junior) need to know javascript php?

Question

PHP

Actually the whole essence of the issue has already been stated above. Thanks everyone for the replies :)

Answer 1

Javascript:
Can you write your simple jQuery slider and get untrusted? Yes? Then you are in business.
Just like in books, functions for working with strings (arrays, objects, context, db, encodings, formats), OPP.
It is enough to go through some kind of video course (at the same time solving practical tasks from the course), where the basics will be hammered into your head, not like PHP, but general fundamental ones. This will be enough to get you started. In addition, once you understand the basics, you can break the shackles of PHP and easily switch to almost any other language.
And then you need to start solving practical problems. Why talk about late static binding and design patterns when you can't write a guest book, for example. Solve simple tasks: write a task planner, a chat, a rating table, a calculator, anything, but at least the same guest book or Tetris. Only experience will turn you from a beginner to a junior.
And finally, a serious motivator for you =)

Answer 2

It depends on what he is a junior.
Take a look at the programs here BootCamp in full anyway.
Further, if phpist, then the php course is complete, if the front-end worker, then at least lvl 1 of the front-end.