可能是特殊字符的编码.您可以询问 json_last_error() 以获得明确信息.

It could be the encoding of the special characters. You could ask json_last_error() to get definite information.

更新:问题已解决，请查看问题中的解决方案"段落.

Update: The issue is solved, look at the "Solution" paragraph in the question.