


Detailed introduction to the basic configuration of CodeIgniter_PHP tutorial
$config['base_url'] = "http://www.jb51.net/". The URL of your website. CodeIgniter will generate links, form addresses, etc. based on this URL.
$config['index_page'] = "index.php" The index.php file name in the CodeIgniter root directory. CodeIgniter will use it to generate the link address. If using a URL that hides index.php, set it to the empty string: $config['index_page'] = "".
$config['uri_protocol'] = "AUTO" The format used by CodeIgniter to generate URLs, set to "AUTO" automatic detection. If the link is not working properly, you can try the following values: PATH_INFO, QUERY_STRING, REQUEST_URI, ORIG_PATH_INFO.
$config['url_suffix'] = "" . The URL suffix used by CodeIgniter when generating links. If you want to achieve pseudo-static, you can set $config['url_suffix'] = ".html".
$config['language'] = "english" . The default language used by the CodeIgniter program is
$config['charset'] = "UTF-8". The default character set used by the CodeIgniter program
$config['enable_hooks'] = FALSE. Whether to enable hooks, the hook function allows you to change or increase the core running functions of the system without modifying the core system files.
$config['subclass_prefix'] = 'MY_' . Set the class name prefix used when extending the CodeIgniter class library
$config['permitted_uri_chars'] = 'a-z 0-9~%.:_-' . Sets the characters allowed in CodeIgniter URLs, which is a regular expression. Visitors will get a warning when they try to access a CodeIgniter URL that contains other characters. You should try to limit the characters used in CodeIgniter URLs to improve security and effectively filter injection attacks. If set to empty, all characters are allowed, which is strongly discouraged.
$config['enable_query_strings'] = FALSE . CodeIgniter URLs use segmented URLs by default, this option also allows CodeIgniter to enable query string form URLs. You can use query strings to pass the controllers and functions you want to access. For example: index.php?c=controller&m=method. CodeIgniter uses segmented URLs by default, and many features of query string URLs are not supported.
$config['controller_trigger'] = 'c' . CodeIgniter treats the value corresponding to this option in the query string as the name of the CodeIgniter controller.
$config['function_trigger'] = 'm' . CodeIgniter treats the value corresponding to this option in the query string as the name of the CodeIgniter controller method
$config['log_threshold'] = 0 . Enable error logging and set what types of errors are logged.
0 = Turn off error logging
1 = Log error information
2 = Log debugging information
3 = Log notification information
4 = Log all information
$config['log_path' ] = "". If you do not want to use the default error logging directory configuration (system/logs/), you can set up the complete server directory.
$config['log_date_format'] = 'Y-m-d H:i:s' . CodeIgniter error log time format
$config['cache_path'] = "". If you don't want to use the default cache directory (system/cache/) to store cache, you can set the full server directory
$config['encryption_key'] = "" . Key used by CodeIgniter
$config['global_xss_filtering'] = FALSE. Whether to automatically filter cross-script attacks on input data (GET, POST)
$config['compress_output'] = FALSE. Enable Gzip compression for fastest page loading speeds
$config['time_reference'] = 'local'. Set time format: "local", "GMT"
$config['rewrite_short_tags'] = FALSE. If you want to use short tags but the PHP server doesn't support it, CodeIgniter can support this functionality by overriding the short tags.
$config['proxy_ips'] = "". If visitors access your website through a proxy server, you must set up a proxy server IP list to identify the visitor's real IP.

Absolute session timeout starts at the time of session creation, while an idle session timeout starts at the time of user's no operation. Absolute session timeout is suitable for scenarios where strict control of the session life cycle is required, such as financial applications; idle session timeout is suitable for applications that want users to keep their session active for a long time, such as social media.

The server session failure can be solved through the following steps: 1. Check the server configuration to ensure that the session is set correctly. 2. Verify client cookies, confirm that the browser supports it and send it correctly. 3. Check session storage services, such as Redis, to ensure that they are running normally. 4. Review the application code to ensure the correct session logic. Through these steps, conversation problems can be effectively diagnosed and repaired and user experience can be improved.

session_start()iscrucialinPHPformanagingusersessions.1)Itinitiatesanewsessionifnoneexists,2)resumesanexistingsession,and3)setsasessioncookieforcontinuityacrossrequests,enablingapplicationslikeuserauthenticationandpersonalizedcontent.

Setting the httponly flag is crucial for session cookies because it can effectively prevent XSS attacks and protect user session information. Specifically, 1) the httponly flag prevents JavaScript from accessing cookies, 2) the flag can be set through setcookies and make_response in PHP and Flask, 3) Although it cannot be prevented from all attacks, it should be part of the overall security policy.

PHPsessionssolvetheproblemofmaintainingstateacrossmultipleHTTPrequestsbystoringdataontheserverandassociatingitwithauniquesessionID.1)Theystoredataserver-side,typicallyinfilesordatabases,anduseasessionIDstoredinacookietoretrievedata.2)Sessionsenhances

PHPsessionscanstorestrings,numbers,arrays,andobjects.1.Strings:textdatalikeusernames.2.Numbers:integersorfloatsforcounters.3.Arrays:listslikeshoppingcarts.4.Objects:complexstructuresthatareserialized.

TostartaPHPsession,usesession_start()atthescript'sbeginning.1)Placeitbeforeanyoutputtosetthesessioncookie.2)Usesessionsforuserdatalikeloginstatusorshoppingcarts.3)RegeneratesessionIDstopreventfixationattacks.4)Considerusingadatabaseforsessionstoragei

Session regeneration refers to generating a new session ID and invalidating the old ID when the user performs sensitive operations in case of session fixed attacks. The implementation steps include: 1. Detect sensitive operations, 2. Generate new session ID, 3. Destroy old session ID, 4. Update user-side session information.


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