INSERT SELECTED VALUES FROM CHECKBOXES INTO DATABASE

VIEW
<?php echo form_open('/controllerName/insert_course') ?>
<input type='checkbox'name='chk[]' value='course name 1'>course name 1<br />
<input type='checkbox'name='chk[]' value='course name 2'>course name 2<br />
<input type='checkbox'name='chk[]' value='course name 3'>course name 3<br />
<input type='checkbox'name='chk[]' value='course name 4'>course name 4<br />
<?php echo form_submit('submit','save'); ?>
<?php echo form_close(); ?>
CONTROLLER
public function insert_course(){
$this->course_model->store_course();
}

MODEL
public function store_course(){
         $data = array();
        foreach($this->input->post('chk') as $value){
            $data[] = array('columName' => $value);

     }

    return $this->db->insert_batch('tableName', $data);
   }