Packet of Disconnect PHP

Hello, I'm working on getting a hotspot set up, and I need the ability to have a user log themselves out, so that they can connect on another computer. I have it set up so that the user can enter their information and have it log them out, but it doesn't disconnect them from the router, so they can continue using the internet until they disconnect from the wireless, so I need to send a packet of disconnect. Is there a way to do this in php?