Form Validation Callback for Matching Password

[eluser]CroNiX[/eluser]
http://ellislab.com/codeigniter/user-gui...#callbacks

To invoke a callback just put the function name in a rule, with "callback_" as the rule prefix. If you need to receive an extra parameter in your callback function, just add it normally after the function name between square brackets, as in: "callback_foo[bar]", then it will be passed as the second argument of your callback function.