HTTPS oddity

Dear all, I have a SSL server set up and I check in PHP that its running over SSL by doing: if ($HTTPS) { ... } This has worked for ages - but sometime last night the behaviour of my/our server changed and now over an non-SSL connection, $HTTPS = ON and over a SSL connection $HTTPS = on (note the change in case). This is odd - and I can't find the source. Unfortunately I'm not the only one with admin access to the server - so someone may have changed something :(. Anyone got any ideas? Where to start looking? Thanks, Nige. -- URL: http://www.grufty.co.uk