You can get Phals to re-bloom on the same spikes by cutting off the old flowers, but leaving the spike. Im sure someone will jump in with the exact way to do this. I dont really know how because Im a big fan of chopping the spike off as soon as the flowers are done. That is because I would rather the plant put all of its energy in creating new growth. Strong new growth equals strong vibrant flowers the next time your 'chid is in bloom. Its definitely a trade off that you can decide for yourself: would you prefer more flowers right now or would prefer stronger, better flowers the next time your plant blooms? There is no correct answer (well, in my head there is!
), only your personal preference.
P.S. I didnt see that this was your first post. Welcome to the Board!!