Can't Import Excel data to Mysql - mysql

Question

I've following the step from this website [https://www.webslesson.info/2018/04/how-to-import-excel-data-into-mysql-database-using-codeigniter.html#comment-form][1]
but when I trying to import the data, my database data still empty
My Import Function in Controller :
public function import()
{
if(isset($_FILES["file"]["name"]))
{
$path = $_FILES["file"]["tmp_name"];
$object = PHPExcel_IOFactory::load($path);
foreach($object->getWorksheetIterator() as $worksheet)
{
$highestRow = $worksheet->getHighestRow();
$highestColumn = $worksheet->getHighestColumn();
for($row=2; $row<=$highestRow; $row++)
{
$customer_name = $worksheet->getCellByColumnAndRow(0, $row)->getValue();
$address = $worksheet->getCellByColumnAndRow(1, $row)->getValue();
$city = $worksheet->getCellByColumnAndRow(2, $row)->getValue();
$postal_code = $worksheet->getCellByColumnAndRow(3, $row)->getValue();
$country = $worksheet->getCellByColumnAndRow(4, $row)->getValue();
$data[] = array(
'CustomerName' => $customer_name,
'Address' => $address,
'City' => $city,
'PostalCode' => $postal_code,
'Country' => $country
);
}
}
$this->pppmodel->insert($data);
echo 'Data Imported successfully';
}
}
My model :
public function insert($data)
{
$this->db->insert('tbl_customer', $data);
}
}
Please help me