Force download PHP

function force_download ($data, $name, $mimetype='', $filesize=false) {
// File size not set?
if ($filesize == false OR !is_numeric($filesize)) {
$filesize = strlen($data);
}

// Mimetype not set?
if (empty($mimetype)) {
$mimetype = 'application/octet-stream';
}

// Make sure there's not anything else left
ob_clean_all();

// Start sending headers
header("Pragma: public"); // required
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false); // required for certain browsers
header("Content-Transfer-Encoding: binary");
header("Content-Type: " . $mimetype);
header("Content-Length: " . $filesize);
header("Content-Disposition: attachment; filename=\"" . $name . "\";" );

// Send data
echo $data;
die();
}
force_download('i am kailash kumar','data.doc');