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<?php class Foo { protected $props; public function __get($key) { if (isset($props[$key])) { return $this->props[$key]; } } public function __set($key, $value) { $this->props[$key] = $value; } } $foo = new Foo; $foo->bar = new Foo; $foo->bar->baz = 'quix'; var_dump($foo->bar, $foo->bar->baz);
Output for git.master, git.master_jit, rfc.property-hooks
Notice: Indirect modification of overloaded property Foo::$bar has no effect in /in/Pmt9p on line 25 Fatal error: Uncaught Error: Attempt to assign property "baz" on null in /in/Pmt9p:25 Stack trace: #0 {main} thrown in /in/Pmt9p on line 25
Process exited with code 255.

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