Let's break the problem down into the constituent parts which are: This answer will circumvent the count/strlen issue as the security of the generated password, at least IMHO, transcends how you're getting there. a requirement for some 3rd party library and I thought it might be interesting to show what it might take to do it yourself.a RNG that isn't considered cryptographically secure.
a smaller character space than you wanted so that either brute-forcing is easier or the password must be longer for the same entropy.I'm going to post an answer because some of the existing answers are close but have one of: Throw new Exception('$keyspace must be at least two characters long') $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' * string $keyspace A string of all possible characters * int $length How many characters do we want? * For PHP 7, random_int is a PHP core function
* pseudorandom number generator (random_int) * Generate a random string, using a cryptographically secure With a secure random integer generator on hand, generating a secure random string is easier than pie: If you don't have random_int(), use random_compat.
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