check_mb_gbk 470 ext/mysqlnd/mysqlnd_charset.c { 28, "gbk", "gbk_chinese_ci", 1, 2, "", mysqlnd_mbcharlen_gbk, check_mb_gbk}, check_mb_gbk 534 ext/mysqlnd/mysqlnd_charset.c { 87, "gbk", "gbk_bin", 1, 2, "", mysqlnd_mbcharlen_gbk, check_mb_gbk},