1.a.php页面 

1     session_start();    
2     $_SESSION['msg'] = "i love you";
3     $sn = session_id();//获取当前session的id
4     header( 'Content-Type: text/html; charset=utf-8' );
5     //跳转到index.php页面,并把session的id传递过去,sn可以随便写
6     header("Location: index.php?sn=".$sn);
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