<?php  if ( ! defined(‘BASEPATH‘)) exit(‘No direct script access allowed‘);/** * 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 = ‘‘, $file = ‘‘)    {        if ($filename == ‘‘ OR $file == ‘‘)        {            return FALSE;        }        // Try to determine if the filename includes a file extension.        // We need it in order to set the MIME type        if (FALSE === strpos($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        if (strpos($_SERVER[‘HTTP_USER_AGENT‘], "MSIE") !== FALSE)        {            header(‘Content-Type: "‘.$mime.‘"‘);            header(‘Content-Disposition: attachment; filename="‘.$filename.‘"‘);            header(‘Expires: 0‘);            header(‘Cache-Control: must-revalidate, post-check=0, pre-check=0‘);            header("Content-Transfer-Encoding: binary");            header(‘Pragma: public‘);            header("Content-Length: ".filesize($file));        }        else        {            header(‘Content-Type: "‘.$mime.‘"‘);            header(‘Content-Disposition: attachment; filename="‘.$filename.‘"‘);            header("Content-Transfer-Encoding: binary");            header(‘Expires: 0‘);            header(‘Pragma: no-cache‘);            header("Content-Length: ".filesize($file));        }        readfile_chunked($file);        die;    }}/** * readfile_chunked * * Reads file in chunks so big downloads are possible without changing PHP.INI * * @access    public * @param    string    file * @param    boolean    return bytes of file * @return    void */if ( ! function_exists(‘readfile_chunked‘)){    function readfile_chunked($file, $retbytes=TRUE)    {       $chunksize = 1 * (1024 * 1024);       $buffer = ‘‘;       $cnt =0;       $handle = fopen($file, ‘r‘);       if ($handle === FALSE)       {           return FALSE;       }       while (!feof($handle))       {           $buffer = fread($handle, $chunksize);           echo $buffer;           ob_flush();           flush();           if ($retbytes)           {               $cnt += strlen($buffer);           }       }       $status = fclose($handle);       if ($retbytes AND $status)       {           return $cnt;       }       return $status;    }}/* End of file MY_download_helper.php *//* Location: ./application/helpers/MY_download_helper.php */