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(PECL mailparse >= 0.9.0)
mailparse_msg_extract_whole_part_file — Extracts a message section including headers without decoding the transfer encoding
$mimemail, string $filename, callable $callbackfunc = ?): string
本函数还未编写文档，仅有参数列表。
mimemail
A valid MIME resource.
filename
callbackfunc
