ngak tahu deh bs ato tidak

<?php
function trimStr($str)
{
  return  trim(preg_replace("/[^a-zA-Z0-9]+/", "\n", strip_tags($str) ));
}
function save_data_target($dataarray,$userfile,$path_file_excel){

        $user_group_id  =$this->session->userdata('user_group_id');
        $cluster_id     =$this->session->userdata('cluster_id');
        $region_id  =$this->session->userdata('region_id');
        $created_on     = date('Y-m-d H:i:s');
        $created_by =$this->session->userdata('user_id');
        $session_id = $this->session->userdata('session_id');
        $territory_id   =$this->session->userdata('territory_type_id');
        $upload_date    = date('Y-m-d H:i:s');

        for($i=1;$i<count($dataarray);$i++){
             $data = array(
                'region_name'=>$dataarray[$i]['region_name'],
                'cluster'=>$dataarray[$i]['cluster'],
                'nik'=>trimStr($dataarray[$i]['nik']),
                'name'=>$dataarray[$i]['name'],
                'kpi_code'=>$dataarray[$i]['kpi_code'],
                'kpi_description'=>$dataarray[$i]['kpi_description'],
                'type_incentive_id'=>$dataarray[$i]['type_incentive_id'],
                'type_incentive'=>$dataarray[$i]['type_incentive'],
                'chanel_code'=>$dataarray[$i]['chanel_code'],
                'type_target_id'=>$dataarray[$i]['type_target_id'],
                'type_target'=>$dataarray[$i]['type_target'],
                'target'=>$dataarray[$i]['target'],
                'month'=>$dataarray[$i]['month'],
                'year'=>$dataarray[$i]['year'],
                'upload_date'=>$upload_date,

                'created_by'=>$this->session->userdata('user_id'),
                'territory_id'=>$territory_id,
                'created_on'=>$created_on,
                'user_group_id'=>$user_group_id,
                'cluster_id'=>$cluster_id,
                'region_id'=>$region_id,
                'session_id'=>$session_id,
                'nama_file_excel'=>$userfile,
                'path_file_excel'=>$path_file_excel
            );
            $this->db->insert('nama_tabel', $data);
        }

    }
?>

// bagaimana cara penulisan trim() sebelum insert ke tabel ?
// saya mau trim() pada kolom nik -> 'nik'=>$dataarray[$i]['nik'],

terima kasih