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<?php declare(strict_types=1); class Foo { private array $data = []; /** @param mixed $value */ public function __set(int $name, $value): void { $this->data[$name] = $value; } public function __isset(int $name): bool { return isset($this->data[$name]); } public function __unset(int $name): void { unset($this->data[$name]); } } $foo = new Foo(); $foo->__set(1, 'one'); $foo->__set(2, 'two'); var_dump( $foo->__isset(1), // true $foo->__isset(2) // true ); $foo->__unset(1); var_dump( $foo->__isset(1) // false );