warning:mysqli::query():mysqlserverhasgoneawayin/disk/wwwroot//yg_book/yg_online20
warning:mysqli::query():errorreadingresultset'sheaderin/disk/wwwroot//yg_book/yg_online20
fatalerror:calltoamemberfunctionfetch_assoc()onanon-objectin/disk/wwwroot//yg_book/yg_online21