Is php supported on glitch ?? or just node js
Yes, PHP is supported. You can remix ~lamp-poc to get started with it.
And a note to @LankyBox01, I am sure every language is not supported. There are languages and frameworks being developed everyday all of which are not used. (And there are languages which are not useful for web apps.)
And you can also read this for a list of other languages-
List of Supported Languages, Frameworks and Package Managers
I have moved this to #glitch-help.