thinkPHP's F method can only be used to cache simple data types, and does not support validity periods and cached objects . The S() cache method supports validity period, also known as dynamic cache method. The usage examples are as follows:
S('data',$Data) ; //The front is the cache mark, and the back is the cached data
S('data',$Data,3600);
S('data',NULL); //The first parameter is the cached identification name
// Determine whether there is a cache for this query
if(!$cache){ //$cache is the identifier of the cache (each query corresponds to a cache, that is, different queries have different caches)
$ cache=$video->where($map)->order($order)->limit($limit)->select();
foreach($cache as $key=>$value ){
$userlist=$user->where("id=".$value['user_id'])->find();
$cache[$key]["nickname"]= $userlist['nickname'];
}
S($cachename,$cache,3600); //Set cache survival time
}
S($cachename,NULL); // Delete cache

PHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.

The security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.

PHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita

ToretrievedatafromaPHPsession,startthesessionwithsession_start()andaccessvariablesinthe$_SESSIONarray.Forexample:1)Startthesession:session_start().2)Retrievedata:$username=$_SESSION['username'];echo"Welcome,".$username;.Sessionsareserver-si

The steps to build an efficient shopping cart system using sessions include: 1) Understand the definition and function of the session. The session is a server-side storage mechanism used to maintain user status across requests; 2) Implement basic session management, such as adding products to the shopping cart; 3) Expand to advanced usage, supporting product quantity management and deletion; 4) Optimize performance and security, by persisting session data and using secure session identifiers.

The article explains how to create, implement, and use interfaces in PHP, focusing on their benefits for code organization and maintainability.

The article discusses the differences between crypt() and password_hash() in PHP for password hashing, focusing on their implementation, security, and suitability for modern web applications.

Article discusses preventing Cross-Site Scripting (XSS) in PHP through input validation, output encoding, and using tools like OWASP ESAPI and HTML Purifier.


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