How to pass layout via JSON to Javascipt from PHP?

Question

PHP

I ate all my brains already =)
In general, the authors who wrote the site obviously did not know that it is very unsafe to use simultaneously in a language file:
1. single quotes
2. double quotes
3. line
breaks 4. layout and tags
5. percent signs in symbols %s, %d and so on for sprintf
Now the json_encode($data, JSON_HEX_QUOT) function does not cope with the direct task.
I take it, I turn it into JSON, then I output it in the template as a
php function:

$data = get_langs();
$json = json_encode($data, JSON_HEX_QUOT);
$smarty->assign('json', $json);

template.htm

<script>
App.Langs.addJson('{$json}');
</script>

If you put single quotes - swears with single quotes.
If double - with double.
I also tried like this:

str_replace("\"", '\"', str_replace("'", '\'', json_encode($data)))

Well, not at all! The last time it showed a conflict at the% sign, I thought the movement - and shish, it replaced the double quote with two slashes instead of one for some reason.
Is there anyone to help?

Answer 1

php.net/manual/en/function.base64-encode.php
And in JS:
PS:

$json = json_encode($data, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE); ///вот так - не работает?!