请求获取并展示二维码
"
创建二维码
('Content-Type: image/png''phpqrcode.phpqrcode' = 'http://XXXXXX/Home/mystudy/showcode?zsnumber='..'&stuName='..'&sfid='..'&kcName='.
.'&kcid='..'&stuid='..''::png(,,'H',8,2,
二维码链接信息处理
)['kcid'] =['userid'] = = D('表名')->where()->->assign('info',->