The discs themselves won't work if your PS 3 wasn't made to do so.  There was only a short span where Sony had PS 3 capable systems that were able to play the older games just fine before they discontinued them because they were too expensive.  The Playstation Network allows you to download all kinds of old PS 1 and 2 games right onto your hard drive but as I said before, trying to use the actual CDs won't work unless you got lucky and got one of the PS 3s that CAN play the old discs just fine.  And I doubt the PS 4 will have gotten that upgrade personally for the same reason that the PS 3 didn't last in that area.