*/ public static function create() { /** @var \PhpOption\Option */ return Some::create(new self()); } /** * Read an environment variable, if it exists. * * @param string $name * * @return \PhpOption\Option */ public function read(string $name) { /** @var \PhpOption\Option */ return Option::fromArraysValue($_SERVER, $name) ->map(static function ($value) { if ($value === false) { return 'false'; } if ($value === true) { return 'true'; } return $value; })->filter(static function ($value) { return \is_string($value); }); } /** * Write to an environment variable, if possible. * * @param string $name * @param string $value * * @return bool */ public function write(string $name, string $value) { $_SERVER[$name] = $value; return true; } /** * Delete an environment variable, if possible. * * @param string $name * * @return bool */ public function delete(string $name) { unset($_SERVER[$name]); return true; } }