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/**
 * Созданию превьюшек
 * https://github.com/verot/class.upload.php
 * @param  string  $file Путь к исходному файлу
 * @param  integer $x    ширина
 * @param  integer $y    высота
 * @return string        Путь к миниатрюре
 */
public static function createThumb($file, $x=500, $y=500) {
    include_once conf::$pref_include."classes/class.upload.php";

    $ext       = strtolower(pathinfo($file, PATHINFO_EXTENSION));
    $name      = md5($file) . $x . $y;
    $thumb     = conf::$http . "images/thumbs/thumb_{$name}.jpeg";
    $newfile   = $_SERVER['DOCUMENT_ROOT'] . "/images/thumbs/{$name}." . $ext;
    $thumbfile = $_SERVER['DOCUMENT_ROOT'] . "/images/thumbs/thumb_{$name}.jpeg";

    if (file_exists($thumbfile)) {
        return $thumb;
    }

    else if (@copy($file, $newfile) || @copy(conf::$pref_include . $file, $newfile)) {
        $handle = new Upload($newfile);
        $handle->file_overwrite     = true; // перезаписать файл
        $handle->image_resize       = true;
        $handle->image_ratio_crop   = true;
        $handle->image_x            = $x;
        $handle->image_y            = $y;
        $handle->image_convert      = 'jpeg';
        $handle->file_name_body_pre = 'thumb_';
        $handle->process($_SERVER['DOCUMENT_ROOT'] . "/images/thumbs/");

        return $thumb;
    }

    return $file;
}