cpt = $cpt; } public function getCpt (): int { return $this->cpt; } public function increment (): void { $this->cpt++; } } RegistryTest::addEntry('cpt_1', 0); RegistryTest::addEntry('cpt_2', 5); var_dump(RegistryTest::getInstance('cpt_1')->getCpt()); var_dump(RegistryTest::getInstance('cpt_2')->getCpt()); RegistryTest::getInstance('cpt_1')->increment(); RegistryTest::getInstance('cpt_2')->increment(); var_dump(RegistryTest::getInstance('cpt_1')->getCpt()); var_dump(RegistryTest::getInstance('cpt_2')->getCpt());