I would just add to what Carol said be patient, new roots might show up in a month or so, but they will .
I have few phal in condition like yours. It took quite a few month to roots show up. I did tried sphag and bag method but it did not work so i left mine in regular home condituons, humidity on average 40-50% and temperature about 80F (it was summer). I misted root and foliage two to three times a day. And they was sitting above container with water. It took i would say about 2 months to start new root growth. Shortly after that new leaf showed up.
So good luck with your phals!
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