check_mb_gbk      510 ext/mysqlnd/mysqlnd_charset.c 	{  28, "gbk", "gbk_chinese_ci", 1, 2, "", mysqlnd_mbcharlen_gbk, check_mb_gbk},
check_mb_gbk      574 ext/mysqlnd/mysqlnd_charset.c 	{  87, "gbk", "gbk_bin", 1, 2, "", mysqlnd_mbcharlen_gbk, check_mb_gbk},