Kafka\Socket::write PHP Method

    public function write($buf)
    {
        $null = null;
        $write = array($this->stream);
        // fwrite to a socket may be partial, so loop until we
        // are done with the entire buffer
        $failedWriteAttempts = 0;
        $written = 0;
        $buflen = strlen($buf);
        while ($written < $buflen) {
            // wait for stream to become available for writing
            $writable = stream_select($null, $write, $null, $this->sendTimeoutSec, $this->sendTimeoutUsec);
            if ($writable > 0) {
                if ($buflen - $written > self::MAX_WRITE_BUFFER) {
                    // write max buffer size
                    $wrote = fwrite($this->stream, substr($buf, $written, self::MAX_WRITE_BUFFER));
                } else {
                    // write remaining buffer bytes to stream
                    $wrote = fwrite($this->stream, substr($buf, $written));
                }
                if ($wrote === -1 || $wrote === false) {
                    throw new \Kafka\Exception\Socket('Could not write ' . strlen($buf) . ' bytes to stream, completed writing only ' . $written . ' bytes');
                } elseif ($wrote === 0) {
                    // Increment the number of times we have failed
                    $failedWriteAttempts++;
                    if ($failedWriteAttempts > $this->maxWriteAttempts) {
                        throw new \Kafka\Exception\Socket('After ' . $failedWriteAttempts . ' attempts could not write ' . strlen($buf) . ' bytes to stream, completed writing only ' . $written . ' bytes');
                    }
                } else {
                    // If we wrote something, reset our failed attempt counter
                    $failedWriteAttempts = 0;
                }
                $written += $wrote;
                continue;
            }
            if (false !== $writable) {
                $res = stream_get_meta_data($this->stream);
                if (!empty($res['timed_out'])) {
                    throw new \Kafka\Exception\SocketTimeout('Timed out writing ' . strlen($buf) . ' bytes to stream after writing ' . $written . ' bytes');
                }
            }
            throw new \Kafka\Exception\Socket('Could not write ' . strlen($buf) . ' bytes to stream');
        }
        return $written;
    }