PHPPM\ProcessManager::onSlaveConnection PHP Method

    public function onSlaveConnection(Connection $conn)
    {
        $this->bindProcessMessage($conn);
        $conn->on('close', \Closure::bind(function () use($conn) {
            if ($this->inShutdown) {
                return;
            }
            if (!$this->isConnectionRegistered($conn)) {
                // this connection is not registered, so it died during the ProcessSlave constructor.
                $this->output->writeln('<error>Worker permanent closed during PHP-PM bootstrap. Not so cool. ' . 'Not your fault, please create a ticket at github.com/php-pm/php-pm with' . 'the output of `ppm start -vv`.</error>');
                return;
            }
            $port = $this->getPort($conn);
            $slave =& $this->slaves[$port];
            if ($this->output->isVeryVerbose()) {
                $this->output->writeln(sprintf('Worker #%d closed after %d handled requests', $slave['port'], $slave['requests']));
            }
            $slave['ready'] = false;
            if (isset($slave['stderr'])) {
                $slave['stderr']->close();
            }
            if (is_resource($slave['process'])) {
                proc_terminate($slave['process'], SIGKILL);
            }
            posix_kill($slave['pid'], SIGKILL);
            //make sure its really dead
            if ($slave['duringBootstrap']) {
                $this->bootstrapFailed($conn);
            }
            $this->newInstance($slave['port']);
        }, $this));
    }