Check array for duplicate

I have modified my form value using Firebug and I get this array (which
should never happen unless someone has edited the form and tried submitting
the altered values)

How could I create a quick 'check the values' function for duplicates to see
if someone was trying to mess with the site?

Array
(
[System] => Array
(
[System] => Array
(
[0] => 1
[1] => 1
[2] => 1
)

)

)

I have the db set so the fields have to be unique so it will not save...but
the view shows
SQL Error: 1062: Duplicate entry '1-3' for key 2
Query: INSERT INTO `users_systems` (`user_id`,`system_id`) VALUES (3,'1'),
(3,'1'), (3,'1')

I would like to check the array for duplicte values before saving, if found
then destroy user session, display message and ban user...just cant figure
ot how to check the array for duplcates.

Ideas?

thanks

Dave

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