Add getRawHeader() method to allow retrieving headers without charset conversion #67
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When the subject of an e-mail cannot be decoded by iconv(), the getHeader('subject') call generates iconv() warnings. It makes it impossible to retrieve the header contents (even without decoding). I added a getRawHeader() to make it possible to access raw headers.
Sample invalid subject (consists of two parts, but decodeHeader() currently doesn't handle that):
=?GB2312?B?1rvSqsTjxNzP66Os1rvSqsTjz+vX9qOsv827p7K7ysfOyszio6zLq8+yyO28?= =?GB2312?B?/rDvxPq94r72o6GjoQ==?=