system/helpers/download_helper.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * NOTICE OF LICENSE
 * 
 * Licensed under the Open Software License version 3.0
 * 
 * This source file is subject to the Open Software License (OSL 3.0) that is
 * bundled with this package in the files license.txt / license.rst.  It is
 * also available through the world wide web at this URL:
 * http://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to obtain it
 * through the world wide web, please send an email to
 * licensing@ellislab.com so we can send you a copy immediately.
 *
 * @package		CodeIgniter
 * @author		EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
 * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * CodeIgniter Download Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/download_helper.html
 */

// ------------------------------------------------------------------------

/**
 * Force Download
 *
 * Generates headers that force a download to happen
 *
 * @access	public
 * @param	string	filename
 * @param	mixed	the data to be downloaded
 * @return	void
 */
if ( ! function_exists('force_download'))
{
	function force_download($filename = '', $data = '')
	{
		if ($filename == '' OR $data == '')
		{
			return FALSE;
		}

		// Try to determine if the filename includes a file extension.
		// We need it in order to set the MIME type
		if (FALSE === strpos($filename, '.'))
		{
			return FALSE;
		}

		// Grab the file extension
		$x = explode('.', $filename);
		$extension = end($x);

		// Load the mime types
		if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
		{
			include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php');
		}
		elseif (is_file(APPPATH.'config/mimes.php'))
		{
			include(APPPATH.'config/mimes.php');
		}

		// Set a default mime if we can't find it
		if ( ! isset($mimes[$extension]))
		{
			$mime = 'application/octet-stream';
		}
		else
		{
			$mime = (is_array($mimes[$extension])) ? $mimes[$extension][0] : $mimes[$extension];
		}
		
		// Generate the server headers
		header('Content-Type: "'.$mime.'"');
		header('Content-Disposition: attachment; filename="'.$filename.'"');
		header('Expires: 0');
		header("Content-Transfer-Encoding: binary");
		header("Content-Length: ".strlen($data));
		header('Pragma: no-cache');

		// Internet Explorer-specific headers.
		if (isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], "MSIE") !== FALSE)
		{
			header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
			header('Pragma: public');
		}

		exit($data);
	}
}


/* End of file download_helper.php */
/* Location: ./system/helpers/download_helper.php */