apc_fectch()获取不到值
这是一个进度条的应用,apc的扩展我确定安装成功了.
- PHP code
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->$status=apc_fecth('upload_'.$_GET['key']);
我用print_r输出$status,什么都没有显示,
前台返回的值是NAn,可我在后台没有其他乱七八糟的输出啊
- PHP code
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->if(isset($_GET['key'])){ echo json_encode(getStatusAPC());}function getStatusAPC(){ $response=false; if($status = apc_fetch('upload_'.$_GET['key'])) { $response=apc_fetch('upload_'.$_GET['key']); } return $response;}if ($_SERVER['REQUEST_METHOD'] == 'POST'){ $myfile=$_FILES['upfile']; echo $myfile['size']; echo $myfile['size']; print_r($myfile); $tempf=$myfile['tmp_name']; $name=$myfile['name']; move_uploaded_file($tempf,'up/'.$name);}
不知问题出在哪里?求教了
------解决方案--------------------
NAN表示这不是一个有效的数字。print_r($status); 无显示,说明没有值嘛
可以参考这篇文章核对一下你的前台代码 http://bioinfo.ustc.edu.cn/seagven/?p=250
------解决方案--------------------
确保,确实有这个key 'upload_'.$_GET['key']

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Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

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SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


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