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<?php interface MyInterface { public function get(): int; public function set(int $value); } class Factory { private $instance = null; public function getInstance(): MyInterface { if ($this->instance === null) { $this->instance = new class() implements MyInterface { private $var; public function get(): int { return $this->var; } public function set(int $value) { $this->var = $value; } }; } return $this->instance; } } function display(MyInterface $object) { var_dump($object->get()); } $factory = new Factory(); $o = $factory->getInstance(); $o->set(5); $o2 = $factory->getInstance(); display($o2);
Output for git.master, git.master_jit, rfc.property-hooks
int(5)

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