View the directory, enter the directory and jump
ls: View the current directory
ll: View detailed directory information
Under some Linux distributions, the ll command cannot be used
ls -l
cd: Enter the directory
cd path, where path can be either an absolute path or a relative path
Absolute path: positioned based on the root directory
Relative path: positioned based on the current directory
cd china/, not absolute positioned, nor. The relative positioning of and. is understood to mean searching from the current directory
Absolute paths and relative paths can be used together.
File/directory operation
Create directory
mkdir path [Can also be created with relative positioning, absolute positioning]
mkdir a b c d, you can create 4 directories at a time
Create cascade directories
mkdir -p /path
Delete directory
rm: The meaning of remove, the rm command can be used to delete ordinary files or non-empty directories, rm -rf directory/directory, can be used to delete non-empty directories
rmdir: used to delete directories and must be Empty directory
Copy/Move directory
cp:copy, copy files or directories
cp -r source path new path
cp -r source path new path/[new directory name], then copy + rename Effect
Move directory
mv source path new path/[new directory name]
If a new directory name is added, it will have a renaming effect
Create file
touch path
Output redirection:> , overwrite;>>, append
delete file
rm path
copy/move file
cp path target/[new file name]
mv file path target path[/new file name]
text Creation and viewing of files
View the content of the file
more /path View the content of the file
Space: Scroll backwards, automatically exit to the last screen
ctrl+b: Scroll forward one page ctrl+f: Scroll backwards One page
Press q to exit
less /path
kongge Scroll backwards, and exit automatically when you reach the last screen.
ctrl+b [turn one page forward], ctrl+f [turn one page backward]
less no Baifenghao reminder,
less will not exit automatically when turning to the last page
Press q to exit
The above has introduced Linux terminal learning 1, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.

Thedifferencebetweenunset()andsession_destroy()isthatunset()clearsspecificsessionvariableswhilekeepingthesessionactive,whereassession_destroy()terminatestheentiresession.1)Useunset()toremovespecificsessionvariableswithoutaffectingthesession'soveralls

Stickysessionsensureuserrequestsareroutedtothesameserverforsessiondataconsistency.1)SessionIdentificationassignsuserstoserversusingcookiesorURLmodifications.2)ConsistentRoutingdirectssubsequentrequeststothesameserver.3)LoadBalancingdistributesnewuser

PHPoffersvarioussessionsavehandlers:1)Files:Default,simplebutmaybottleneckonhigh-trafficsites.2)Memcached:High-performance,idealforspeed-criticalapplications.3)Redis:SimilartoMemcached,withaddedpersistence.4)Databases:Offerscontrol,usefulforintegrati

Session in PHP is a mechanism for saving user data on the server side to maintain state between multiple requests. Specifically, 1) the session is started by the session_start() function, and data is stored and read through the $_SESSION super global array; 2) the session data is stored in the server's temporary files by default, but can be optimized through database or memory storage; 3) the session can be used to realize user login status tracking and shopping cart management functions; 4) Pay attention to the secure transmission and performance optimization of the session to ensure the security and efficiency of the application.

PHPsessionsstartwithsession_start(),whichgeneratesauniqueIDandcreatesaserverfile;theypersistacrossrequestsandcanbemanuallyendedwithsession_destroy().1)Sessionsbeginwhensession_start()iscalled,creatingauniqueIDandserverfile.2)Theycontinueasdataisloade

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.


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