Stream::read

public function read(int $length): string
{
	if (!$this->resource)
	{
		throw new \RuntimeException('No resource available, cannot read.');
	}

	if (!$this->isReadable())
	{
		throw new \RuntimeException('Stream is not readable.');
	}

	$result = fread($this->resource, $length);

	if ($result === false)
	{
		throw new \RuntimeException('Error reading stream.');
	}

	return $result;
}