Is php necessary to be a full stack developer

Good day freecodecampers, i need to ask do i need to learn php to be a full stack developer

PHP is used in some stacks, but you don’t need to know all the languages to be a full stack developer

you would only need it if you were hired to work on a PHP system

Okay now I get it, but one more question is it necessary to learn node.js / react and flask/Django to be a full stack developer

same answer, you don’t need all the languages to be a full stack developer, you can focus on one stack only unless you want to expand your knowledge