Or in actuality, how to tell if a certain technique has became a standard in certain language / framework?
As I understood from my readings so far, PHP supports DI in PSR-11 while Laravel uses it out of the box...
But does this mean DI is a standard for PHP and Laravel or they just helped you to do it right, should you choose to use DI?
Or in actuality, how to tell if a certain technique has became a standard in certain language / framework?
Closest thing to a standard in PHP is PSR. Apart from that, all frameworks, libraries and individual programmers have different approaches.
As I understood from my readings so far, PHP supports DI in PSR-11 while Laravel uses it out of the box...
You have misunderstood. Dependency Injection is something that you as a programmer use to properly structure an application, that generally improves testability, readability and maintainability of your code. Any language that supports passing arguments to a function supports dependency injection.
Laravel... actually is generally the inverse of using dependency injection, even though they might advertise featuring a dependency injection container, that is used to instantiate your types. Laravel depends, as far as I know, on the global state for most actions, calls static functions from anywhere, which is the exact contrary of injecting dependencies into a class.
