force_download not working in codeigniter after writing - codeigniter

Question

tried to auto download file after file created but its not working. file creating and appending data perfectly but download functionality not working
public function getexportfile(){
$this->load->dbutil();
// $this->load->database('DB_utility','dbutil');
//$this->load->helper('download_helper','download');
$this->load->helper('download_helper');
$this->load->helper('file');
error_reporting(0);
ini_set('display_errors', 0);
$postdata = file_get_contents("php://input");
$request = json_decode($postdata);
## Condition Start
$sWhere = " where condition"; // where conditon
$date = date('Y-m-d');
$filename = 'app/logs/othermarketplace_'.$date.'.csv';
$data = $this->PMP->export($sWhere); // calling model
$result = $this->dbutil->csv_from_result($data);
write_file($filename,$result); // file creating write data perfectly
$data = file_get_contents($filename);
//$path = file_get_contents(base_url().$filename);
//$name = "othermarketplace_'.$date.'.csv";
//force_download($nme, $pth);
force_download($filename,$data);
}
anything i missed?

Answer 1

From docs:
// Contents of photo.jpg will be automatically read
force_download('/path/to/photo.jpg', NULL);
//$data = file_get_contents($filename);
//$path = file_get_contents(base_url().$filename);
//$name = "othermarketplace_'.$date.'.csv";
//force_download($nme, $pth);
if (!is_file($filename)) {
exit('No file found.');
}
force_download($filename, NULL);
Note:
These lines might be doing something weird. Perhaps remove them as they aren't being used:
error_reporting(0);
ini_set('display_errors', 0);
$postdata = file_get_contents("php://input");
$request = json_decode($postdata);