Comments (2)
One way to achieve that is to store the results in a database and verify the new codes against the older ones.
from phpqrcode.
The above solution is a good solution if you want to be really sure every id ar unique.
But you can also generate an uuid v4, chances are high for the id to be unique.
see:
https://github.com/ramsey/uuid
from phpqrcode.
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from phpqrcode.