Enhanced CsrfGuard #83
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When the token has been used and thus unset, it needs to be created again in case we want to use it in a form.
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This pull request allows the user to use a secret to generate tokens. $_SERVER is quite easy reverse engineerable. Even more so on shared hosting accounts.
Also, after a token has been used it will be removed and a new token will be generated before the variables are assigned to the template. This way a token can't be guessed by looking at previous pages with a form.