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<?php class TokenGenerator { const ALPHABET = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; public function generateToken($length = 16) { $alphabetSize = strlen(self::ALPHABET); $token = ''; while (strlen($token) < $length) { $randomBytes = $this->generateRandomBytes(32); $offset = abs(hexdec(bin2hex(substr($randomBytes, 0, 4)))) % $alphabetSize; $token .= substr(self::ALPHABET, $offset, 1); } return $token; } private function generateRandomBytes($length) { $bytes = ''; // pre-fill with weak bytes while (strlen($bytes) < $length) { $bytes .= chr(mt_rand(0, 255)); } // merge with mcrypt iv if (function_exists('mcrypt_create_iv')) { $bytes = hash_hmac('sha256', $bytes, mcrypt_create_iv($length, MCRYPT_DEV_URANDOM), true); } // merge with openssl bytes if (function_exists('openssl_random_pseudo_bytes')) { $bytes = hash_hmac('sha256', $bytes, openssl_random_pseudo_bytes($length), true); } // merge with urandom if (file_exists('/dev/urandom') && is_readable('/dev/urandom')) { $bytes = hash_hmac('sha256', $bytes, file_get_contents('/dev/urandom', null, null, null, $length), true); } return substr($bytes, 0, $length); } } $gen = new TokenGenerator(); var_dump($gen->generateToken(10)); var_dump($gen->generateToken(10)); var_dump($gen->generateToken(10)); var_dump($gen->generateToken(20)); var_dump($gen->generateToken(20)); var_dump($gen->generateToken(20));

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