When providing pattern and/or input mask rules, you must observe the following: If you would like to perform a validation that is not directly supported by Marmot, you can create your own validation functions via a "callback" validation rule.If, for example, we wished to make sure that a name entered by a user was a character on Scooby Doo, we might do the following: Since validation is performed before our script is parsed, the function specified in the callback rule must reside in the application's file.Use of the date rule requires that a valid format attribute also be included for the field.

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One downside to this is the added complexity of developing an interface that validates data and displays errors. Most of the added complexity of server-side validation is handled behind-the-scenes by Marmot.

Examples can be found in the "Forms- Validation" example included with Marmot.

The base_value may be either an explicit date value or a reference to another form field.

Sometimes it is not sufficient to validate what the data is or is not.

Data validation is important to the proper functioning of any application.

There are two opportunities to validate data entered via web forms.Since this is an item of type "numeric," it is automatically validated as a number.The validate rules "required:max=4:min=0" specify that the element is required and must be between 0 and 4. However, if multiple rules are applied to an element, the validation process will throw a warning on the first violation and stop processing that element.Please refer to the section on pattern matching and input masks below for a full description.Calculates a new value by applying formula to base_value. The formula must be a value acceptable to PHP's strtotime function (eg ' 1 year').The limit value can either be explicitly supplied, can be the value of another form field, or can even be calculated.