PHP_MBSTR_MAIL_MIME_HEADER4 4233 ext/mbstring/mbstring.c #define PHP_MBSTR_MAIL_MIME_HEADER4 "Content-Transfer-Encoding: " PHP_MBSTR_MAIL_MIME_HEADER4 4307 ext/mbstring/mbstring.c #undef PHP_MBSTR_MAIL_MIME_HEADER4