How to convert this string in to thai language. Thank

I am programming PHP get email but in email subject is thai language. I am use functon imap_open() and imap_headerinfo(). I am read it. It's return "=?tis-620?B?4ajpp8PQwtDgx8XS4rTgwbnLwbTN0sLYos2nIHlhLWRlZS5jb20=?=". What happen return this string and how to convert this string into thai language. Thank you very much.
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