PHP读取文件

     $s = serialize($_SESSION); //序列化对象a
   
     $fp = fopen("sessionInfo", "w");//以"w"方式打开一文件并获得文件句柄,请在此注意目录属性.
   
     fputs($fp, $s);//写入文件
   
     fclose($fp);//关闭文件句柄
   
    $us = implode("", @file("sessionInfo"));
    $_SESSION = unserialize($us);