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<?php class A { private $b; public function A() { $this->b = new B(); } public function get_b() {return $this->b;} public function print_b() {echo $this->b->str;} } class B { public $str = "Not modified\n"; } $a = new A(); $a->print_b(); $b = $a->get_b(); $b->str = "Your ownership is useless.\n"; $a->print_b();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Attempt to read property "str" on null in /in/aAEmZ on line 13 Fatal error: Uncaught Error: Attempt to assign property "str" on null in /in/aAEmZ:23 Stack trace: #0 {main} thrown in /in/aAEmZ on line 23
Process exited with code 255.

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