The content of this article is about error handling of PHP Basics Six, which has a certain reference value. Now I share it with everyone. Friends in need can refer to it
<!-- 错误处理 --> <?php //php错误处理之禁止显示错误(display_errors) ini_set('display_error', 0); echo '服务器中display_errors的状态为'.ini_get('display_errors'); ?> <!-- php错误处理值错误报告级别 --> <?php // E_ERROR // E_WARNING // E_NOTICE // E_PARSE // E_ALL // E_STRICT // E_DEPRECATED error_reporting(); @$fp = fopen('adsaf.txt', 'r'); echo 1; ?> <!-- php错误处理之错误记录日志 --> <?php // php.ini中的配置 // log_errors // log_errors_max_len // error_log(重点) echo ini_get('log_errors'); error_log("无法连接到数据库服务器服务器"); error_log('可以用邮件报告错误,让运维人员半夜 起床干活',1,'pig@php.cn'); error_log("我是一个错误哟",3,"d:/test/my-errors.log"); ?> <!-- php错误处理之自定义错误处理函数 --> <?php function customError($errno, $errstr, $errfile,$errline){ echo "<b> Custom error:</b> [$errno] $errstr <br />"; echo "Error on line $errline in $errfile<br/>"; echo "Ending Script"; exit; } set_error_handler("customError"); $test=2; if ($test > 1) { trigger_error("A custom error has been triggered"); } ?>
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Effective methods to prevent session fixed attacks include: 1. Regenerate the session ID after the user logs in; 2. Use a secure session ID generation algorithm; 3. Implement the session timeout mechanism; 4. Encrypt session data using HTTPS. These measures can ensure that the application is indestructible when facing session fixed attacks.

Implementing session-free authentication can be achieved by using JSONWebTokens (JWT), a token-based authentication system where all necessary information is stored in the token without server-side session storage. 1) Use JWT to generate and verify tokens, 2) Ensure that HTTPS is used to prevent tokens from being intercepted, 3) Securely store tokens on the client side, 4) Verify tokens on the server side to prevent tampering, 5) Implement token revocation mechanisms, such as using short-term access tokens and long-term refresh tokens.

The security risks of PHP sessions mainly include session hijacking, session fixation, session prediction and session poisoning. 1. Session hijacking can be prevented by using HTTPS and protecting cookies. 2. Session fixation can be avoided by regenerating the session ID before the user logs in. 3. Session prediction needs to ensure the randomness and unpredictability of session IDs. 4. Session poisoning can be prevented by verifying and filtering session data.

To destroy a PHP session, you need to start the session first, then clear the data and destroy the session file. 1. Use session_start() to start the session. 2. Use session_unset() to clear the session data. 3. Finally, use session_destroy() to destroy the session file to ensure data security and resource release.

How to change the default session saving path of PHP? It can be achieved through the following steps: use session_save_path('/var/www/sessions');session_start(); in PHP scripts to set the session saving path. Set session.save_path="/var/www/sessions" in the php.ini file to change the session saving path globally. Use Memcached or Redis to store session data, such as ini_set('session.save_handler','memcached'); ini_set(

TomodifydatainaPHPsession,startthesessionwithsession_start(),thenuse$_SESSIONtoset,modify,orremovevariables.1)Startthesession.2)Setormodifysessionvariablesusing$_SESSION.3)Removevariableswithunset().4)Clearallvariableswithsession_unset().5)Destroythe

Arrays can be stored in PHP sessions. 1. Start the session and use session_start(). 2. Create an array and store it in $_SESSION. 3. Retrieve the array through $_SESSION. 4. Optimize session data to improve performance.

PHP session garbage collection is triggered through a probability mechanism to clean up expired session data. 1) Set the trigger probability and session life cycle in the configuration file; 2) You can use cron tasks to optimize high-load applications; 3) You need to balance the garbage collection frequency and performance to avoid data loss.


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