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Editorial Team
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Asked: 2026-05-30T22:49:30+00:00

I am exporting data through files. The output is base64 encoded data. $data =

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I am exporting data through files. The output is base64 encoded data.

$data = base64_encode(serialize($data));

Which results in something like:

bGFzcyI6MTp7czo1OiJzZXR1cCI7YTo3Mzp7czoyNToicGFnZXNfY29udGFjdF91c19oZWFkbGlu

So I am wondering what charset is more suitable for this data (plain text). us-ascii seems enough but utf-8 always seems an error-proof default.

header('content-type: text/plain; charset=utf-8');
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1 Answer

  1. Editorial Team

    It really doesn’t matter; your content is valid US-ASCII, valid UTF-8, valid ISO-8859-1 (or, I believe, any ISO-8859-x), valid Windows-1252, and so on. Just don’t put UTF-16 or EBCDIC or something.

    (For what it’s worth, I’d go with US-ASCII, because it’s fully supported by even pre-Unicode computers without being so explicitly a pre-Unicode character-set as ISO-8859-1 or whatnot; but that’s really a subjective preference.)

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