PHP page continuously refreshes problem

Description: the PHP page either continuously refreshes doing a dongle check each time (if the correct dongle is attached); or does nothing (if the correct dongle is not attached).

Solution: if your php pages have non-ascii characters (e.g. for non-English languages) then some text editors (e.g. notepad) will save the files with a byte-order marker (BOM). This can cause display problems on some servers so it is recommended that you save your php files without the BOM.