protected function start()
    {
        $this->processes[] = $this->createProcess()->handleOutputUsing(function ($type, $line) {
            call_user_func($this->output, $type, $line);
        });

        return $this;
    }
protected function start()
    {
        $this->processes[] = $this->createProcess()->handleOutputUsing(function ($type, $line) {
            call_user_func($this->output, $type, $line);
        });

        return $this;
    }
protected function start ( ) { $ this -> processes [ ] = $ this -> createProcess ( ) -> handleOutputUsing ( function ( $ type , $ line ) { call_user_func ( $ this -> output , $ type , $ line ) ; } ) ; return $ this ; }
Add a new worker process to the pool.

@return $this
Add a new worker process to the pool .