PHP: What is that character encoding of this string?

In PHP开发者_如何学Go, i have the following string: =CA=CC=D1=C8=C9

what is its character encoding?

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It does not make sense to have a string without knowing what encoding it uses.

Those 5 bytes mean different things in different encodings.

• In UTF-8, it's invalid. All lead bytes and no trail bytes.
• In ISO-8859-1 and windows-1252, it's the string ÊÌÑÈÉ.
• According to chardet, it's in KOI8-R, and decodes to йляхи

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The answer and comments that you got assumed that you knew already that the transportation encoding was "quoted-printable" ... decoding using that, "=CA=CC=D1=C8=C9" becomes "\xCA\xCC\xD1\xC8\xC9" (which is NOT UTF-8, as you asked for in a comment) ... and they concentrated on what encoding might reasonably be used to produce Unicode out of that. To arrive at UTF-8, you need two more steps: decode "\xCA\xCC\xD1\xC8\xC9" into Unicode (using an encoding appropriate to Arabic text) and then encode into UTF-8.

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It is called quoted printable

I can deceode it using :

quoted_printable_decode($string);