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If you're running a standard config, HTTPS is on port 443, so you can just check if the port isn't 443.

 

if ($_SERVER['SERVER_PORT'] == 443) {
echo 'SSL';
}
else {
echo 'Not SSL';
}

 

I also believe that $_SERVER['HTTPS']='on' evaluates to true if you're on HTTPS (in Apache at least).

EDIT: to slow!

 

if ($_SERVER['HTTPS'] != "on") { 
   echo 'SSL';
}
else {
   echo 'Not SSL';
}

 

You'll have to do if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') because the HTTPS index in $_SERVER is only present if you're actually on HTTPS. Otherwise you'll get that E_NOTICE about undefined indices.

 

Also note that you've negated it, so you'll get the opposite.

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