Seldaek/monolog · error · RuntimeException

Could not write to socket

Error message

Could not write to socket

What it means

Error "Could not write to socket" thrown in Seldaek/monolog.

Source

Thrown at src/Monolog/Handler/SocketHandler.php:395

    {
        if (null !== $this->chunkSize && false === $this->streamSetChunkSize()) {
            throw new \UnexpectedValueException("Failed setting chunk size with stream_set_chunk_size()");
        }
    }

    private function writeToSocket(string $data): void
    {
        $length = \strlen($data);
        $sent = 0;
        $this->lastSentBytes = $sent;
        while ($this->isConnected() && $sent < $length) {
            if (0 === $sent) {
                $chunk = $this->fwrite($data);
            } else {
                $chunk = $this->fwrite(substr($data, $sent));
            }
            if ($chunk === false) {
                throw new \RuntimeException("Could not write to socket");
            }
            $sent += $chunk;
            $socketInfo = $this->streamGetMetadata();
            if (\is_array($socketInfo) && (bool) $socketInfo['timed_out']) {
                throw new \RuntimeException("Write timed-out");
            }

            if ($this->writingIsTimedOut($sent)) {
                throw new \RuntimeException("Write timed-out, no data sent for `{$this->writingTimeout}` seconds, probably we got disconnected (sent $sent of $length)");
            }
        }
        if (!$this->isConnected() && $sent < $length) {
            throw new \RuntimeException("End-of-file reached, probably we got disconnected (sent $sent of $length)");
        }
    }

    private function writingIsTimedOut(int $sent): bool
    {

View on GitHub (pinned to 57eb102834)

When it happens

Trigger: Thrown at src/Monolog/Handler/SocketHandler.php:395 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Seldaek/monolog@57eb102834 (2026-08-17). Data as JSON: /api/errors/b4c39f21af7ab0c4. Report an issue: GitHub.