This tutorial shows how to work with custom validation in Codeigniter. We need many times that a field has to be validated against some type of values but built-in features do not provide all kind of validation pattern, so we need to write a function which will be used as callback function for a particuler input field for validation purpose. The below example validates the date field and if the date is invalid then it displays an appropriate error message to the user.
View part: application/views/date.php


Controller part:

Usage Example


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