hmm... this gets more strange...
ok, I'm assuming that you are using 1 php.ini file (i.e. http & https reside on the same host or virtual host)... try these:
print "You said ".$testing;
print "You Said ".$_GET['testing'];
print "You SAID ".$HTTP_GET_VARS['testing'];
If that produces no results, check this bug report for a similar issue:
http://bugs.php.net/bug.php?id=11059
paying close attention to the line at the bottom:
"I've recompiled php and apache and it works"
Sorry I couldn't be of more help ;-)