<?php
    function getUri($key){
        $uri = '';
        switch ($key) {
            case 'kintecast001':
                $uri = 'https://www.youtube.com/watch?v=NAhHrxC7RNM';
                break;
            case 'kintecast002':
                $uri = 'https://www.youtube.com/watch?v=nh1P9vZuBP4';
                break;
            case 'kintecast003':
                $uri = 'https://www.youtube.com/watch?v=0K6_hs2CcxI';
                break;
            case 'kintecast004':
                $uri = 'https://www.youtube.com/watch?v=nfdIYipJ1o4';
                break;
        }
        return $uri;
    }

    function redirect($url, $statusCode = 303)
    {
       header('Location: ' . $url, true, $statusCode);
       die();
    }

    $key = (array_key_exists('key',$_GET))? $_GET['key'] : '';
    $uri = getUri($key);

    if((strlen($uri) == 0))
    {
        $uri = 'http://'
            . $_SERVER['SERVER_NAME']
            . str_replace('redirect.php', '', $_SERVER['PHP_SELF']);
    }

    redirect($uri, 301);
?>