PHP language performance inspection_PHP tutorial
Today, I used to be an ASP.NET believer. Later, through the application of high-traffic websites, my experience tells me that Microsoft targets most of the middle and low-end people because its series of products are bloated. , but intelligently, such as SQL Server, IIS, and other bundled services, as well as the ASP.NET runtime library, the page must perform too many initialization operations, making the page slow and occupying too much memory.
Today I plan to examine the performance bottom line and operating mechanism of PHP, hoping for a good result!
The PHP core is executed in the middle of Opcode run by the Zend Engine component, just like the Framework runtime of .NET. But there is a big difference. Zend Engine is a virtual machine. It interprets and executes Opcode, that is, it reads and executes each sentence, similar to ASP. But because OpCode is binary, has standard syntax and is byte-based, the reading performance is very fast, much faster than ASP. .NET is said to be converted into computer language and then directly called and run. It is said that .net will be faster, but in fact, .NET plus some bloated class libraries and unknown compilation process, the speed cannot keep up with the interpretation and execution of PHP.
Thinking from the perspective of enterprise needs, too high performance is not the first requirement. The program must be simple to reduce development costs, and the performance can meet the needs. PHP's solution for large websites can meet their needs, because it is simple, sophisticated, and although its performance is not the best, its performance consumption can be supported by ordinary businesses. Most importantly, it consumes It's just a little bit and you can ignore it, but asp.net is different. No matter how big the problem is, you can still use a cluster solution to solve it.
PHP supports FPM process management mode, which allows for good processing performance when dealing with large traffic and large memory requirements.
Support fastcgi, which can be better compatible with the interfaces of various high-performance servers, and even Linux runs very well!
Overall evaluation, PHP is still more suitable for the application of portal websites and high-traffic sites.

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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