Accessing an USB port with PHP

Hi everybody,
I am not sure if here is the best place to ask my question because is in "twilight zone".
It is, first of all, about PHP but there is a Linux machine and the Apache.
I already do some little things around with php sending/receiving data through serial port (tty) from a web page.
Now the question: how can I do the same with USB (not USB to serial!).
Example: send/receive data to/from a Bluetooth dongle on USB port, access the memory stored on a USB key, accessing the stream from a USB webcam, etc...

Thank you for your time,
CTVarlan