Summary of commonly used terms in dedecms system_PHP tutorial
Global tags
Global tags refer to individual template tags used on website homepages, individual pages, and channel covers. In list or article templates, generally only channel and arclist tags (hotart, coolart, imglist, etc.) are allowed to be called. are all tags extended from this tag), but the environment variable is limited to the column where the article or list is located. If the tag you want to test is used in a list or article, please specify the environment variable (column ID).
Custom tag
Custom tags refer to template tags applied in the corresponding column. The display content is specified in advance and then displayed in the list or article template. It can be understood as a JS call/a simple advertising management system, supporting time Range display content, expired display content, HTML code.
Channel Model
The channel model is used to customize the fields in the database. After you define your own fields, you can use the fields you defined when using the template language. When used for column parameter setting, it is used to specify the properties of the content published in the entire column. For example, to create a product library column, you need product name, product type, and product pictures. Parameters, etc., you can freely increase or decrease
collection nodes
Collection refers to intercepting specified content from external websites. A node can be understood as a channel/column. A collection node refers to the name of an internal channel/column corresponding to a specified collection content
are allowed to be called
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.

PHP sessions have a significant impact on application performance. Optimization methods include: 1. Use a database to store session data to improve response speed; 2. Reduce the use of session data and only store necessary information; 3. Use a non-blocking session processor to improve concurrency capabilities; 4. Adjust the session expiration time to balance user experience and server burden; 5. Use persistent sessions to reduce the number of data read and write times.

PHPsessionsareserver-side,whilecookiesareclient-side.1)Sessionsstoredataontheserver,aremoresecure,andhandlelargerdata.2)Cookiesstoredataontheclient,arelesssecure,andlimitedinsize.Usesessionsforsensitivedataandcookiesfornon-sensitive,client-sidedata.

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


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