Dedecms v5.7 background login blank solution

Http://bbs.dedecms.com/simple? T470641.html

I fixed it myself ....

PHP File Location: Include/userlogin. Class. php

Check the keepuser () function in userlogin. Class. php,
Rewrite all @ session_register, although I don't know what this @ means

Comment out @ session_register ($ this-> keepuseridtag), and change it
If (! Isset ($ _ session [$ this-> keepuseridtag])

There are 6 in all.
As follows:
If (! Isset ($ _ session [$ this-> keepuseridtag])
// @ Session_register ($ this-> keepuseridtag );
$ _ Session [$ this-> keepuseridtag] = $ this-> userid;

If (! Isset ($ _ session [$ this-> keepusertypetag])
// @ Session_register ($ this-> keepusertypetag );
$ _ Session [$ this-> keepusertypetag] = $ this-> usertype;

If (! Isset ($ _ session [$ this-> keepuserchanneltag])
// @ Session_register ($ this-> keepuserchanneltag );
$ _ Session [$ this-> keepuserchanneltag] = $ this-> userchannel;

If (! Isset ($ _ session [$ this-> keepusernametag])
// @ Session_register ($ this-> keepusernametag );
$ _ Session [$ this-> keepusernametag] = $ this-> username;

If (! Isset ($ _ session [$ this-> keepuserpurviewtag])
// @ Session_register ($ this-> keepuserpurviewtag );
$ _ Session [$ this-> keepuserpurviewtag] = $ this-> userpurview;

If (! Isset ($ _ session [$ this-> keepadminstyletag])
// @ Session_register ($ this-> keepadminstyletag );
$ _ Session [$ this-> keepadminstyletag] = $ adminstyle;


Then you can log on to the background.