php 之 cookie 和 session 简单解读(笔记)
cookie:保存值在本地,也就是客户端。优点是可以设置保存多长长时间,但不安全
session : 保存在服务器,关掉浏览器就木了
如:登陆页面有个文本框的名字为 "username",登陆成功后在显示页(xs.php)面显示?登陆的用户名 ,并有个退出的文字按钮
登陆页面代码如下:
$username=$_POST['username']; //得到文本框中的值,这里就是用户名 setcookie('username',$username,time()+3600); // 这里设置 cookie的名称,指向设置的值(就是指向上面用户名),然后是保存时间为3600
显示页面代码:?
echo "用户名为:".$_COOKIE[username]; //取得用户名 echo "<a href="xs.php?out=out" mce_href="xs.php?out=out">退出</a>"; //给一退出用户名的按钮链接,原理就是重新设置cookie的值为空 if($_GET['out']) { setcookie('username',''); //这里就设置了为空 echo "<mce:script type="text/javascript"><!-- location.href='login.php' // --></mce:script>"; //重新跳转到登陆页面 }
?? ?上面最后 echo 是这样的:echo "<script>location.href='login.php'</script>";
session?
?登陆页面代码
session_start(); //启动session,这里必须写文件的最上面 $username=$_POST['username']; $_SESSION[username]=$username;
?显示页面:
session_start(); echo "欢迎您".$_SESSION[username]; echo "<a href="xs.php?out=out" mce_href="xs.php?out=out">退出</a>"; if($_GET['out']) { unset($_SESSION[username]); //这里就是清除session echo "<mce:script type="text/javascript"><!-- location.href='login.php' // --></mce:script>"; }?
?

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

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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