简单的文件上传方法

function file_custom_code($file)
{
    $fileName = basename($file['name']);
    $dir = IA_ROOT."/addons/we7_coupon/txts";
    chmod($dir, 0777);  //修改文件权限
    if (!is_dir($dir)) {
        mkdir($dir, 0777, true);//创建多级目录
    }
    $fileName = date('YmdH').'.txt';
    $newFile = $dir . "/" . $fileName;
    if (is_uploaded_file($file['tmp_name'])) {
        $res = move_uploaded_file($file['tmp_name'], iconv("gb2312", "utf-8", $newFile));
        if (!$res) {
            return false;
        } else {
            return $newFile;
        }
    }
}