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<?php class Maybe { private function __construct(private mixed $value = null) {} public static function Some(mixed $v): static { return new static($v); } public function value(): mixed { return null === $this->value ? throw new Exception() : $this->value; } public function __invoke(callable $c): static { return null===$this->value ? $this : static::Some($c($this->value)); } } function double($x) { return $x * 2; } $res = Maybe::Some(30) (double::class) (chr::class) (fn($x) => strlen($x)); var_dump($res->value());
Output for git.master_jit, git.master, rfc.property-hooks
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