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<?php class A { protected $foo = 'initial'; public function get():string {return $this->foo; } public function set(string $bar): A {$this->foo = $bar; return $this;} } class B extends A { public function set(string $bar): B {$this->foo = $bar.'!'; return $this;} } $a = new A; $b = new B; $a->set('A'); $b->set('B'); var_dump([$a->get(), $b->get()]);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(1) "A" [1]=> string(2) "B!" }

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