/usr/share/php/GuzzleHttp/Stream/NullStream.php is in php-guzzle-stream 3.0.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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namespace GuzzleHttp\Stream;
use GuzzleHttp\Stream\Exception\CannotAttachException;
/**
 * Does not store any data written to it.
 */
class NullStream implements StreamInterface
{
    public function __toString()
    {
        return '';
    }
    public function getContents()
    {
        return '';
    }
    public function close() {}
    public function detach() {}
    public function attach($stream)
    {
        throw new CannotAttachException();
    }
    public function getSize()
    {
        return 0;
    }
    public function isReadable()
    {
        return true;
    }
    public function isWritable()
    {
        return true;
    }
    public function isSeekable()
    {
        return true;
    }
    public function eof()
    {
        return true;
    }
    public function tell()
    {
        return 0;
    }
    public function seek($offset, $whence = SEEK_SET)
    {
        return false;
    }
    public function read($length)
    {
        return false;
    }
    public function write($string)
    {
        return strlen($string);
    }
    public function getMetadata($key = null)
    {
        return $key ? null : [];
    }
}
 |