string getDefaultOption() Returns the name of the default option. Override this method

array getRequiredOptions() Returns the name of the required options. Override this method

class Length extends Constraint

class IdenticalToValidator extends

class GreaterThan extends

class CardSchemeValidator extends

class GreaterThanValidator extends

class Callback extends Constraint

static bool checkDate(int $year, int $month, int $day) Checks whether a date is valid

class Choice extends Constraint