function rotate($rotate=false){
    if(!$rotate)return true;
    $img=$this->tmp_name;
        $source=false;
        switch($this->fileType){
            case 'jpg':
                $source = imagecreatefromjpeg($img);
                $source = imagerotate($source, $rotate, 0);
                imagejpeg($source,$img);
                break;
            case 'png':
                $source = imagecreatefrompng($img);
                $source = imagerotate($source, $rotate, 0);
                imagepng($source,$img);
                break;
            case 'gif':
                $source = imagecreatefromgif($img);
                $source = imagerotate($source, $rotate, 0);
                imagegif($source,$img);
                break;
        }
        if($source)imagedestroy($source);
    return true;
}