search some duplicate data befor save data problem

i have this array:

Array
(
[Usercat] => Array
(
[subcat_id] => Array
(
[0] => 3
[1] => 1
)

[user_id] => 2
[group_id] => 5
)

)

i want befor save data in usercat table, search usercat table for
duplicate subcat_id with user_id if subcat_id with user_id not exist
store subcat_id with user_id,what i am must to do?

example:
i have subcat_id=1 with user_id=2 in usercat table,now i want only
save subcat_id=3 with user_id=2 in usercat table.

this is my function for save array subcat_id in usercat table in
Usercat Model:

function save($data = null, $validate = true, $fieldList = array())
{
$return = false;
if (isset($data['Usercat']['subcat_id']) &&
is_array($data['Usercat'] ['subcat_id'])) {
foreach ($data['Usercat']['subcat_id'] as
$subcat) {
$saveData = array(
'user_id' => $data['Usercat']
['user_id'],
'subcat_id' => $subcat,
);
$this->create();
$return = parent::save($saveData); //
here can add some tests ...
}
}elseif (isset($data['Usercat']['subcat_id']) && !
is_array($data['Usercat'] ['subcat_id'])){

$this->create();
$return = parent::save($data);
}
return $return;
}

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