This example uses a helper to download a very large file, of 200 MB, which can't be downloaded in one file reading.
This example will be constructed from the following helpers:
application/helpers/my_download_helper.php: This is the CI helper that is used to download a very large fileapplication/controllers/classg2.php: This is the controller that uses themy_downloadhelperapplication/views/classg2view.php: This is the view that has a link for the file download
Let us assume that the URI to the project root is http://mydomain.com/myproject. Hence the URI to execute the auth controller for login will be http://mydomain.com/myproject/classg2.
This helper is used to download very large files, which can't be downloaded in one file reading. Its function, download_large_files, reads 1 MB in each loop until it downloads the whole file.
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'),
/*** CodeIgniter Download Helpers** @package CodeIgniter* @subpackage Helpers* @category Helpers* @author Yehuda Zadik*/
// --------------------------------------------------------------
/*** Download large files** Generates headers that force a download to happen** @access public* @param string $fullPath* @return void*/
function download_large_files($fullPath){
// File Exists? if( file_exists($fullPath) ){
// Parse Info / Get Extension $fsize = filesize($fullPath); $path_parts = pathinfo($fullPath); $ext = strtolower($path_parts["extension"]);
// Determine Content Type
switch ($ext) {
case "pdf": $ctype = "application/pdf"; break;
case "exe": $ctype = "application/octet-stream";
break;
case "zip": $ctype = "application/zip";
break;
case "doc": $ctype = "application/msword"; break;
case "xls":$ctyp = "application/vnd.ms-excel";
break;
case "ppt": $ctype = "application/vnd.ms-powerpoint";
break;
case "wmv": $ctype = "video/x-ms-wmv";
break;
case "gif": $ctype = "image/gif";
break;
case "png": $ctype = "image/png";
break;
case "jpeg":case "jpg": $ctype = "image/jpg";
break;
default: $ctype = "application/force-download";
}
$file_handle = fopen($fullPath, "rb");
header('Content-Description: File Transfer'),
header("Content-Type: " . $ctype); header('Content-Length: ' . $fsize);
header('Content-Disposition: attachment; filename=' .
basename($fullPath));
while(!feof($file_handle)) {$buffer = fread($file_handle, 1*(1024*1024));
echo $buffer; ob_flush();flush(); //These two flush commands seem to have helped with performance
}
fclose($file_handle);
} else{die('File Not Found'),
}
}
/* End of file my_download_helper.php *//* Location: ./application/helpers/my_download_helper.php */The controller loads the helper my_download and calls its function, download_large_files, in order to enable the user to download large files that originally could not be downloaded, using the my_download helper.
<?php
class Classg2 extends CI_Controller {
public function index()
{
$this->load->helper('url'),
$this->load->view('classg2view'),
}
function download(){
// Loading the helpers url, my_download
$this->load->helper(array('url', 'my_download')); // FCPATH is a constant that Codeigniter sets which // contains the absolute path to index.php
$fullPath = FCPATH . 'files/movie-classg2.wmv';
// Using the helper my_download function to download // a very large filedownload_large_files($fullPath);
}
}
/* End of file classg2.php *//* Location: ./application/controllers/classg2.php */The view file displays the data that contains a link for downloading the very large file.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Download large file</title>
</head>
<body>
<div id="container">
<a href="<?php echo base_url("classg2/download") ?>">Download large file</a>
</div>
</body>
</html>