结束会话/清除cookie

Question

Ok, so I've got some legacy code from another company that I have to maintain/repair. One of the features of this code is that there are several sites tied to this one main site, and whenever you navigate from the other sites to this site, a logo from the other site is displayed on the main site (basically this is a service for multiple banks to use, and each bank wants its own branding).

The problem is is that once you navigate from, say, site1 to main site, if you then navigate from site2 to main site, you'll still get site1's branding.

Is there a way to clear a session's cookies? So far they've got code like this, which should THEORETICALLY work:

    else
    {
        setcookie("cuid","",time() - 31536000); //DELETES COOKIE

        if( $cuid_demo!="samplecu" && $cuid!="samplecu" )
            setcookie("cuid",$cuid,time()+2592000); //2592000 = 1 month

        $link=dbconnect();

        if(!$link)
            die("error: Could not connect to database - ".dberror() );

        select_db($link) or die("error: ".dberror() );

        if (isset($admin_id))
        {
            $cuid = $admin_id;
            $id = $admin_id;
        }

        $query="UPDATE cusucceed SET visits=visits+1 WHERE id = '$cuid'";
        $result=dbquery($link, $query)or die("Database Server Error 2: ".dberror());
        include("index_main.php");

    } //END IF/ELSE TO CHECK FOR PREVIOUS VISIT WITH THE PAST MONTH
}

Before it does nothing. Shouldn't setcookie("cuid", "", time() - 31536000); delete the cookie, as the comments say?

Answer 1

You need to set correct domain for cookie when you reset it.

setcookie('name', NULL, -86400, 'cookie_path', 'subdomain.site1.com');