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joomla/com_wk1/site/wk1.php

<?php
/** 
* @package     Joomla.Administrator 
* @subpackage  com_wk1 
* 
* @copyright 
*/
    // No direct access to this file
defined('_JEXEC') or die('Restricted access'); 
$fun = 9;
if ($fun == 1) {
    echo "<html><body><h1>wk1.php direct echo<h1>from " . __file__ . "</body>";
    jExit();
} elseif ($fun == 2) {
//    $fn = 'images/cyrSpa50.jpg';
    $fn = '/wkArchive/bilder/2016/1608steingletscher/DSCN0310p700.JPG';
    $mimeTypes = array(
        'pdf' => 'application/pdf',
        'txt' => 'text/plain',
        'html' => 'text/html',
        'exe' => 'application/octet-stream',
        'zip' => 'application/zip',
        'doc' => 'application/msword',
        'xls' => 'application/vnd.ms-excel',
        'ppt' => 'application/vnd.ms-powerpoint',
        'gif' => 'image/gif',
        'png' => 'image/png',
        'jpeg' => 'image/jpg',
        'jpg' => 'image/jpg',
        'php' => 'text/plain'
        );
    if ( ! is_readable($fn) ) {
        echo "<h1>is not readable: $fn</h1>";
    } elseif ( ! is_file($fn) ) {
        echo "<h1>is not a regular file: $fn</h1>";
    } elseif ( ! isset($mimeTypes[$ty = strtolower(substr($fn, strrpos($fn, '.') + 1))]) ) {
        echo "<h1> tiletype '$ty' not supported for file: $fn</h1>";
    } else {
        header('Content-Type: ' . $mimeTypes[$ty]);
        readFile($fn);
    }
    jExit();
} elseif ($fun == 9) {
    echo '<ul><li> component wk1 from ' . __file__ ;
    echo '</li><li>$_SERVER[REQUEST_METHOD] = ' . $_SERVER['REQUEST_METHOD'];
    echo '</li><li>$_SERVER[REQUEST_URI] = ' . $_SERVER['REQUEST_URI'];
    echo '</li><li> $_GET = '; print_r($_GET); 
    echo '</li><li> $_POST = '; print_r($_POST); 
    echo '</li><li> headers_list() = '; print_r(headers_list());
    echo '</li><li> headers_sent() = '; print_r(headers_sent());
    echo '</li><li>filesize = ' .    filesize('/wkArchive/bilder/2016/1608steingletscher/DSCN0310p700.JPG');
    echo '</li><li>JURI toString  = ' .JURI::getInstance()->toString();
    echo '</li><li>JURI  = '; print_r(JURI::getInstance());
    echo '</li><li>input->get(file)  = '; print_r(JFactory::getApplication()->input->get('file', 'fileUndefined'));       
    echo '</li><li>input  = '; print_r(JFactory::getApplication()->input);       
    echo '</li><li>Wk1::log</li>' . Wk1Router::$msg . '</ul>';
    echo '</li></ul>';
}

    // Get an instance of the controller prefixed by wk1
$controller = JControllerLegacy::getInstance('Wk1'); 
    // Perform the Request task
$input = JFactory::getApplication()->input;
$controller->execute($input->getCmd('task')); 
// Redirect if set by the controller
$controller->redirect();