“未定义变量:_SESSION"对比.“一个会话已经开始" [英] "Undefined variable: _SESSION" VS. "A session had already been started"

问题描述

嘿.我有一些 php 脚本.其中一个我有代码 session_start()，当我在另一个脚本中再次有 session_start() 时，我收到通知:

<块引用>

注意:会话已经开始...

这是合乎逻辑的.但是当我删除它时，我收到错误/通知:

<块引用>

注意:未定义变量:_SESSION

为什么?我该如何解决?当我在脚本中有两个位置 session_start() 时，脚本工作正常(只有一点点通知)，但当我没有两个 session_start() 时，脚本根本不起作用.

是唯一的解决方案

error_reporting(E_ALL ^ E_NOTICE);

在我的脚本中?忽略通知不是不好的做法吗?

我的部分代码:

 试试 {//session_start();$STH = DB::prepare ("更新用户 SET DJ_name=?, DJ_showname=?WHERE id=?");$STH->execute(array($_POST['DJ_name'], $_POST['DJ_showname'], $_SESSION['userid']));pre_dump($_SESSION);$_SESSION['DJ_name'] = $_POST['DJ_name'];$_SESSION['DJ_showname'] = $_POST['DJ_showname'];}

输出:

<块引用>

注意:未定义变量:_SESSION in D:.....\main.php on line 19

注意:未定义变量:_SESSION in D:.....\main.php on line 21

空

预转储代码:

 函数 pre_dump($var){echo '
';var_dump($var);echo '</pre>';}
解决方案
我自己发现了错误.在我的脚本中某处有一个我没有注意到的 session_start().现在似乎一切正常.
Hey.
I have some php scripts. In one of them i have the code session_start(), and when I in another script again have session_start() i get the notice:

  
Notice: A session had already been started...
Thats logical. But when I remove it I get the error/notice:

  
Notice: Undefined variable: _SESSION
Why? And how do I fix it? The scripts works fine when I have session_start() two places in the script (only get an little notice), but doesn't work at all when I doesn't have two session_start().

Is the only solution to have an
error_reporting(E_ALL ^ E_NOTICE);
in my script? And isn't that bad practice to just ignore notices? 

Edit:

Parts of my code:
            try {
            //session_start();

            $STH = DB::prepare  (   "UPDATE users SET DJ_name=?, DJ_showname=? WHERE id=?" );
            $STH->execute(array($_POST['DJ_name'], $_POST['DJ_showname'], $_SESSION['userid']));

            pre_dump($_SESSION);

            $_SESSION['DJ_name']        =   $_POST['DJ_name'];
            $_SESSION['DJ_showname']    =   $_POST['DJ_showname'];
        }
Output:

  
Notice: Undefined variable: _SESSION in D:.....\main.php on line 19
  
  
Notice: Undefined variable: _SESSION in D:.....\main.php on line 21
  
  
NULL
pre_dump code:
    function pre_dump($var)
{
    echo '<pre>';
    var_dump($var);
    echo '</pre>';
}

解决方案
I found the error myself.
Had an session_start() somewhere in my script that I didn't notice. Everything seems working now.

                        
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