head_enc         4208 ext/mbstring/mbstring.c 		head_enc,	/* header transfar encoding */
head_enc         4225 ext/mbstring/mbstring.c 	head_enc = mbfl_no_encoding_base64;
head_enc         4230 ext/mbstring/mbstring.c 		head_enc = lang->mail_header_encoding;
head_enc         4350 ext/mbstring/mbstring.c 		pstr = mbfl_mime_header_encode(&orig_str, &conv_str, tran_cs, head_enc, "\n", sizeof("Subject: [PHP-jp nnnnnnnn]"));