PHP_MBSTR_MAIL_MIME_HEADER2 4255 ext/mbstring/mbstring.c #define PHP_MBSTR_MAIL_MIME_HEADER2 "Content-Type: text/plain" PHP_MBSTR_MAIL_MIME_HEADER2 4329 ext/mbstring/mbstring.c #undef PHP_MBSTR_MAIL_MIME_HEADER2