PHP-包含会话变量的页面必须链接？

i have a php snippet saying: if this session variable is this, change the header location to this.

the session variables arent working, however.

must the pages be linked?

$query = mysql_query("SELECT * FROM `username` WHERE `password` = '$pword' AND `username` = '$uname'");
$exsists = 0;

    WHILE($rows = mysql_fetch_array($query)){
     $exsists = 1;
     break;
     }
        if ($exsists){
        $_SESSION['usern23']=$uname;
        $_SESSION['logged']=1;
        header('Location: logged2.php');

                }

$_SESSION['usern'] wont show up on logged2.php

No they do not have to be linked, but you need to have session_start() at the top of your code on both pages.

Take a look at the documentation to read about session_start()

Also:

After the header('Location: logged2.php'); nothing else should be executed. When your script reaches that line, it will redirect you and you will never see the message you have next.

You should use session_write_close(); to save a session before doing a redirect.

http://php.net/manual/en/function.session-write-close.php