Compare array Value's from multiple input forms

[eluser]verynewtothis[/eluser]
Try writing a custom validation which would use array_unique function.. This will tell you if there is a duplicate entry exists or not.

Code:

http://www.php.net/array_unique

User guide on writing a custom validation:

Code:

http://ellislab.com/codeigniter/user-guide/libraries/form_validation.html#callbacks