Vers 8.x compatibility

Hello: php v 8.x questions https://www.php.net/manual/en/migration80.incompatible.php The ability to call non-static methods statically has been removed. Thus is_callable() will fail when checking for a non-static method with a classname (must check with an object instance). Q: does this mean that calling a class method with self::methodName() from within the class will not work? I assume that static methods have to be declared as such or am I misunderstanding ’static’ methods? I seem to remember the use of $this in a method makes the method not static. I define all of the methods I write in such a way that they never rely on $this or non static variables. One other question: In Googling php v8 I came up with a reference to the v8js. This is the first time I have encountered it. Is there a publication that will address it in greater depth than I could find on the php manual pages? It appears that it essentially does eval on js code strings and shares the result with php. Am I on the right track? Thanks for time and attention JK