Description:
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From manual page: https://php.net/function.json-encode
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When the string contains special chars like ''（Hexadecimal character <0x14>），use the function json_encode($str, JSON_UNESCAPED_UNICODE) ，the result is \u0014 (PHP version 5.4 ~ 7.0).I don't know what the char is.Please check it and resove.

Test script:
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echo json_encode('this is a test:my name is ABCÄÄÄÄ', JSON_UNESCAPED_UNICODE);

Expected result:
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this is a test:my name is ABCÄÄÄÄ

Actual result:
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this is a test:my name is ABCÄ\u0014Ä\u0014Ä\u0014Ä