


Share the function of parsing url with Chinese characters in php_PHP tutorial
Sharing of the url function that parses Chinese characters in php
This article mainly introduces the sharing of the url function that parses Chinese characters in php. This article directly gives the implementation code, key points It is about the use of rawurlencode function. Friends who need it can refer to it
Many times, when writing web applications, you will encounter the problem of conflict between Chinese and other characters. For example, some URL links contain Chinese characters, so when you use wget/curl/file_get_contents, etc. to obtain information, you will directly conflict. A big "404" will be very speechless.
A small function is written here to solve this problem. It is only limited to parsing in the path. You can check the manual for the related functions involved.
The code is as follows:
function urlConvert($url){
$pathArr = array();
$modules = parse_url($url);
$path = $modules['path'];
$pathSplit = explode(‘/’, $path);
foreach ($pathSplit as $row){
$pathArr[] = rawurlencode($row);
}
$urlNew = $modules['scheme']."://".$modules['host'].implode(‘/', $pathArr);
return $urlNew;
}

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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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