How To Put In Json Object Non-english Letters?

I am android developer. And I get my data from MySQL database via PHP code:

Solution 1:

$someJSON = json_encode($someArray, JSON_UNESCAPED_UNICODE);

is fine. The problem is elsewhere. See "question mark" in here

The most likely cause/fix:

The column in the database table is not CHARACTER SET utf8 (or utf8mb4). Fix this. (Verify with SHOW CREATE TABLE.)

Note: the JSON really has question marks; the data cannot be recovered from it. You must go back and rebuild the JSON.

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