Is it possible to limit access to a mobile website via qr code only?
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It won’t be absolute accuracy, but if you use a query string it should narrow down the results For example : index.php?refer=QR. I would just like to state now that I am by no means experienced with PHP, so please don’t hit me too hard if I get something wrong ;).
Perhaps you could make it so the QR code redirects to a site and that site generates a key, even something as simple as the date and time. Therefore your query string could be: index.php?refer=QR&c=1215
If the code in the query string doesn’t match that of the one currently in use then the person has been linked via direct entry, if it does match then a QR code was used.