PHP json_encode既漂亮又不转义

Question

我正在尝试从mysqli数据库中创建一个.txt文档，并且像这样成功：

header('Content-disposition: attachment; filename='.$lang.'.txt');
header('Content-type: text/plain; charset=utf-8');

$jsonData = [];
$result = mysqli_query($con, "SELECT * FROM ReloadedSnippets WHERE app = $app AND type=0 ORDER BY id");
while ($row = mysqli_fetch_assoc($result)) {
    $snippetId = $row['id'];

    $result1 = mysqli_query($con,"SELECT * FROM ReloadedTranslations WHERE fk_snipId=$snippetId AND lang='$lang' AND app=$app");
    $row1 = mysqli_fetch_assoc($result1);

    $string1 = $row1["translation"];
    //$string1 = mysqli_real_escape_string($con,$string1);
    $jsonData[$row['snippet']] = $string1;
}

$jsonString = json_encode($jsonData, JSON_UNESCAPED_UNICODE);
echo $jsonString;

现在，我的问题是所有内容都以大行打印在txt文档中！我想使用JSON_PRETTY_PRINT，但是当我还需要使用JSON_UNESCAPED_UNICODE时该怎么做？

希望获得帮助并提前致谢：-）