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<?php declare(strict_types=1); class Foo { private $data = []; public function __set($name, $value) { $this->data[$name] = $value; } public function __isset($name) { return isset($this->data[$name]); } public function __unset($name) { unset($this->data[$name]); } public function __get($name) { return $this->data[$name]; } } $foo = new Foo(); $foo->__set('uno', 'one'); $foo->__set(2, 'two'); var_dump( $foo->uno, $foo->__get(2) );