How to solve the Chinese garbled character in PHP Mail

The main problem is coding:

The solution is: the reading of the data set up a good encoding method, the message is also specified when the encoding;

Use the function Base64_encode () to encode the data using the MIME base64
The title string is pre-encoded type such as: =? UTF-8? B?
Of course, if it's gb2312. GB2312? B?
Title string after add:? =

-----------My configuration reference---------

 