/* Directory with or without trailing slash as rtrim will remove it anyway. */
$szDir = './app/controllers/';

/* Glob acquires all the files for us with the extension specified (WMV). */
$aFiles = glob(rtrim($szDir, '/') . '/*.wmv');

/* Glob already outputs in alphabetical order, so reverse to show it's working. */
$aFiles = array_reverse($aFiles);

/* Get the existing files and don't display those in the subsequent loop. */
$aExisting = array('TestController', 'ErrorController');

foreach ($aFiles as $szFile)
{
    $szFilename = pathinfo($szFile, PATHINFO_FILENAME);
    
    /* If the file exists in the $aExisting array, skip displaying it. */
    if (in_array($szFilename, $aExisting))
    {
        continue;
    }
    
    /* Echo the radio buttons using the relevant data. */
    printf
    (
        '<input type="radio" name="trailer" value="%s" /><font color="black">%s</font><br />',
        $szFilename, basename($szFile)
    );
}