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[PHP] Null Coalesce Operator and Undefined Indexes


	I'm using PHP 7.1 now and just changed some code to use the Null Coalesce Operator, like so:

$ua       = sanitize($_SERVER['HTTP_USER_AGENT']) ?? null;
$request  = sanitize($_SERVER['REQUEST_URI'])     ?? null;
$protocol = sanitize($_SERVER['SERVER_PROTOCOL']) ?? null;
$method   = sanitize($_SERVER['REQUEST_METHOD'])  ?? null;

	However, this morning I found this line in my error log:

[25-Nov-2017 03:51:48] PHP Notice:  Undefined index: HTTP_USER_AGENT in /home/user/public_html/scripts/index.php on line 45

	This doesn't make sense to me.  I thought this function was supposed to eliminate this warning.  Is it because I've wrapped the first variable with a function?  How/why is this happening?

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