php get_headers and get_meta_tags function examples_PHP tutorial
get_headers is to get the http header information, get_meta_tags is to get the description, abstract, keywords and other information of the web page
get_headers is to get the http header information, get_meta_tags is to get the description, abstract, keywords and other information of the web page
*/
$url='http://www.bKjia.c0m'; //Define url
print_r(get_headers($url)); //Get without format
print_r(get_headers($url,1)); //Get the format
/*
array
(
[0] => http/1.1 200 ok
[1] => connection: close
[2] => date: sat, 11 dec 2010 05:43:46 gmt
[3] => content-length: 69617
[4] => content-type: text/html
[5] => content-location: http://www.bKjia.c0m/index.html
[6] => last-modified: sat, 11 dec 2010 05:19:51 gmt
[7] => accept-ranges: bytes
[8] => etag: "e8be4b9f398cb1:6c66"
[9] => server: microsoft-iis/6.0
[10] => x-powered-by: asp tutorial.net
)
array
(
[0] => http/1.1 200 ok
[connection] => close
[date] => sat, 11 dec 2010 05:43:47 gmt
[content-length] => 69617
[content-type] => text/html
[content-location] => http://www.bKjia.c0m/index.html
[last-modified] => sat, 11 dec 2010 05:19:51 gmt
[accept-ranges] => bytes
[etag] => "e8be4b9f398cb1:6c66"
[server] => microsoft-iis/6.0
[x-powered-by] => asp.net tutorial
)
get_meta_tags($url);
Get the description, abstract, keywords and other information of the specified web page
*/
$tags=get_meta_tags('http://www.bKjia.c0m/'); //Extract meta tags
print_r($tags) //Output the entire contents of the array
/*
array
(
[description] => The webpage production tutorial website provides professional webpage design tutorials and webpage production tutorials, including photoshop tutorials, flash, html, css tutorials, dreamweaver, fireworks, asp, php tutorials, jsp tutorials, asp.net, website construction, Website development, web special effects, graphic design, personal website, web material
[abstract] => Provides the latest webpage production tutorials, webpage design tutorials, webpage special effects, webpage material templates and webpage video learning for personal websites.
[keywords] => Web design tutorials, web production tutorials, web learning, photoshop, flash, html, css, dreamweaver, fireworks, asp, php, jsp, asp.net, web special effects, graphic design, web materials
)
Note: To use this function, you need to set allow_url_fopen = on in php.ini to use it

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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