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Possible Duplicate:
Secure random number generation in PHP
We need to generate a cryptographically random string to use as an authentication token, which will be tied to session data in the database. We are using PHP, which doesn’t appear to have a suitable random number generator built-in. How can we generate a cryptographically secure random string of N length using php?
Also note, due to the nature of our application, shell_exec is off the table.
what about
uniqid? docs have an example of how it can be used for cookies/sessions.