Stream::getSize()

106    public function getSize(): ?int107    {108        if (null !== $this->size) {109            return $this->size;110        }111        if (!isset($this->stream)) {112            return null;113        }114        // Clear the stat cache if the stream has a URI115        if ($uri = $this->getUri()) {116            \clearstatcache(\true, $uri);117        }118        $stats = \fstat($this->stream);119        if (isset($stats['size'])) {120            $this->size = $stats['size'];121            return $this->size;122        }123        return null;124    }