Return back values to view if any error in form fields

It is well documented here in form_validation library docs:
https://www.codeigniter.com/user_guide/l...g-the-form

And here in the form_helper helper docs:
https://www.codeigniter.com/user_guide/h...#set_value

Basically, if your input name is 'user_name' you repopulate the value using something like:

PHP Code:

<input type="text" name="user_name" value="<?php echo set_value('user_name', ''); ?>" /> 


Where the second value is the default value, commonly blank.

Paul.