I have a strange problem. Basically, I dont know much about php at all, but my colleague has developed an intranet for the school that we work in. It has a log in system and lots of applications including a messaging system.
We have a problem though that is popping up across the school.
On certain machines when users are typing in their usernames and passwords (and selcting the staff button) then clicking login, they are just being presented with a COMPLETELY white page. The source code of that page is just about 10 lines of basic html / php code that just consists of opening and closing body tags / header tags etc. refreshing that page and resubmitting that data SOMETIMES lets the user log in, but other times they could try 1000000 times and it still won't let them on. Completely deleting all temporary internet files / cookies / form data etc sometimes gets it working too, but we have yet to find a fix that works every time. This will fix the problem for a couple of days then the fault will return.
It is not specific to certain machines, it has been appearing on random ones, but there are certain machines that seem to get it more often than others.
ALSO, the messaging system has been having a similar issue. When a user is submitting a message, sometimes it just does not get added to the database at all, and although they are directed to the "message sent successfully" page, the message doesnt appear anywhere. clearing all temporary internet files and cookies seems to solve this issue for a short amount of time too sometimes.
Does anybody have any ideas about what could be causing these issues? My colleague has looked through all of his code and cannot see any faults whatsoever. Unfortunately I cannot post any of the code onto this site because the system is copyrighted by the school. (not even snippets i am afraid
Thanks for reading!