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<?php declare(strict_types = 1); final class Foo implements \Stringable { private function __construct(public readonly string $value) { } public static function fromString(string $string): self { return new self($string); } /** * {@inheritdoc} */ public function __toString(): string { return $this->value; } } $options = [ Foo::fromString('c'), Foo::fromString('b'), Foo::fromString('a'), Foo::fromString('ccc'), Foo::fromString('bcc'), ]; uasort($options, strnatcasecmp(...)); var_dump($options); var_dump(strnatcasecmp(Foo::fromString('c'), Foo::fromString('b')));