Subclass rewriting of parent class attributes .... Search for confusion

Subclass rewriting of parent class attributes .... Solve the problem of rewriting the parent class attribute of the php subclass

 Sal ;}} class Manager extends Employer {protected $ sal = 5000; public function getParentSal () {return parent: getSal (); // call the parent class method to return the parent class property, why is the 5000} public function getSal () {return $ this-> sal ;}}$ manager = new Manager; echo $ manager-> getParentSal (). PHP_EOL; // 5000 why is it 5000, but the version below 5.3 seems to be 3000 ???? Echo $ manager-> getSal (); // 5000?>

Reply to discussion (solution)

Why not?

5.2.10
5000 5000

5.4.20
5000 5000

Why not?

5.2.10
5000 5000

5.4.20
5000 5000
Can the moderator describe in detail? Why do I use parent: To access the attributes of the parent class? how do I read the attributes of the child class? How is the rewrite method used for rewriting?

Protected is only a protection mode, and will naturally be covered by the quilt class.

Replace protected with private.