This RFC adds generic type syntax to PHP. Classes, interfaces, traits, functions, methods, closures, and arrow functions can declare type parameters; those parameters carry bounds, defaults, and variance markers; type arguments may be supplied at use sites and at call sites via turbofish.
A new syntax for declaring the “set” operation visibility of an object property
Chain method on newly created objects without parentheses
This makes life easier for those who already use generics with PHPdoc and changes nothing for those who don't use them and don't want to use them.