src/Uri.php
protected function withString(string $string, string $name = 'query'): self
    {
        $string = ltrim((string) $string, '#');
        $clone = clone $this;
        $clone->{$name} = $this->filterQuery($string);

        return $clone;
    }
protected function withString(string $string, string $name = 'query'): self
    {
        $string = ltrim((string) $string, '#');
        $clone = clone $this;
        $clone->{$name} = $this->filterQuery($string);

        return $clone;
    }
withString function.

@access protected
@param string $name (default: 'query')