Zend_Validate_GreaterThan allows you to validate if a given value is greater than a minimum border value. It should be noted that Zend_Validate_GreaterThan supports only the validation of numbers. Strings or dates can not be validated with this validator. The following options are supported for Zend_Validate_GreaterThan: min: Sets the minimum border value. To validate if a given value is greater than a defined border simply use the following example. 10)); $value = 11; $return = $valid->isValid($value); // returns true ]]> The above example returns TRUE for all values which are greater than 10. 10)); $value = 10; $return = $valid->isValid($value); // returns false ]]> The above example returns FALSE for all values which are lesser or equal to the minimum border value.