


In HTML and PHP writing, echo can output multiple strings at the same time without parentheses.
Print can only output one string at the same time and requires parentheses.
The usage of print is very similar to C language, so % in the output content will be specially interpreted.
echo has no return value, print() has a return value, and returns false when its execution fails (such as disconnection).
echo can have multiple parameters and print one parameter. It is recommended to use echo.
Look at the example below to understand what print
Copy the code The code is as follows:
print
$value;

...
EOT;
Meaning:
EOT The custom delimiter must be at the beginning of the line when it ends;
Use tags in the same page;
Note: tag names are not allowed to appear in pairs, and more than two tag names with the same name are not allowed to appear on the same page;
Another: the tag name at the end of the paired tag name should be separate One line, no characters are allowed to be output before and after... (such as spaces and other invisible but existing characters...).
Advantages: This can output large sections of HTML without escaping the quotation marks or "" and automatically replaces the variables inside.
How to output html code (EOT) in php
PHP code
Copy the code The code is as follows:
echo
ClassID | stuno | Student name | Parent name | Parents mobile number |

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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