Minimum/Maximum times to repeat character List to seed from $chrList = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' To break it down so the parameters are clear // Character List to Pick from echo substr(str_shuffle(str_repeat('0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', mt_rand(1,10))), 1, 10) Here is a simple one-liner that generates a true random string without any script level looping or use of OpenSSL libraries. $b = random_str(8, 'abcdefghijklmnopqrstuvwxyz') ĭemo: (Ignore the PHP 5 failures it needs random_compat) Throw new \RangeException("Length must be a positive integer") String $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 * This function uses type hints now (PHP 7+ only), but it was originally * pseudorandom number generator (random_int) * Generate a random string, using a cryptographically secure With a secure integer generator in place, generating a random string with a CSPRNG is a walk in the park. You should always check with your resident StackExchange cryptography experts before you deploy a home-grown algorithm in production. Safely generating random integers in PHP isn't a trivial task. The simple, secure, and correct answer is to use RandomLib and don't reinvent the wheel.įor those of you who insist on inventing your own solution, PHP 7.0.0 will provide random_int() for this purpose if you're still on PHP 5.x, we wrote a PHP 5 polyfill for random_int() so you can use the new API even before you upgrade to PHP 7. There are a lot of answers to this question, but none of them leverage a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG).
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