tokengrid is a PHP class that can be used to generate a grid of tokens to authenticate users. Such a grid is similar to those that banks provide to users to avoid account abuses after phishing attacks. It generates a bidimensional array of tokens of limited length with letters and digits. The generated grid is seeded by a given secret salt string and a specific id that may be used to generate unique grids for different applications and users. The class may also verify whether a token entered by the user corresponds to a token of a random grid position.
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