generateSalt() protected method
Generates a salt that can be used to generate a password hash. The PHP crypt() built-in function requires, for the Blowfish hash algorithm, a salt string in a specific format: "$2a$", "$2x$" or "$2y$", a two digit cost parameter, "$", and 22 characters from the alphabet "./0-9A-Za-z".
protected string generateSalt ( $cost = 13 )$cost integer
The cost parameter return string
The random salt value. throws yii\base\InvalidParamException
if the cost parame