Backend DevelopmentPHP TutorialPHP text operation method collection comparison page 1/2_PHP tutorialPHP text operation method collection comparison page 1/2_PHP tutorial
String reading and writing functions fgets and fputs
1. Reading string function The function of fgets function is to read a string from the specified file into a character array. The function call is in the form: fgets (character array name , n, file pointer); where n is a positive integer. Indicates that the string read from the file does not exceed n-1 characters. Add the end-of-string mark ' after the last character readLine 16 of the program opens the binary file "stu_list" in read-write mode. After inputting two student data, it is written into the file. Then the internal position pointer of the file is moved to the beginning of the file. After reading out the two * blocks, it is displayed on the screen. show.
How does PHP identify a user's session?May 01, 2025 am 12:23 AMPHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.
What are some best practices for securing PHP sessions?May 01, 2025 am 12:22 AMThe 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.
Where are PHP session files stored by default?May 01, 2025 am 12:15 AMPHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita
How do you retrieve data from a PHP session?May 01, 2025 am 12:11 AMToretrievedatafromaPHPsession,startthesessionwithsession_start()andaccessvariablesinthe$_SESSIONarray.Forexample:1)Startthesession:session_start().2)Retrievedata:$username=$_SESSION['username'];echo"Welcome,".$username;.Sessionsareserver-si
How can you use sessions to implement a shopping cart?May 01, 2025 am 12:10 AMThe steps to build an efficient shopping cart system using sessions include: 1) Understand the definition and function of the session. The session is a server-side storage mechanism used to maintain user status across requests; 2) Implement basic session management, such as adding products to the shopping cart; 3) Expand to advanced usage, supporting product quantity management and deletion; 4) Optimize performance and security, by persisting session data and using secure session identifiers.
How do you create and use an interface in PHP?Apr 30, 2025 pm 03:40 PMThe article explains how to create, implement, and use interfaces in PHP, focusing on their benefits for code organization and maintainability.
What is the difference between crypt() and password_hash()?Apr 30, 2025 pm 03:39 PMThe article discusses the differences between crypt() and password_hash() in PHP for password hashing, focusing on their implementation, security, and suitability for modern web applications.
How can you prevent Cross-Site Scripting (XSS) in PHP?Apr 30, 2025 pm 03:38 PMArticle discusses preventing Cross-Site Scripting (XSS) in PHP through input validation, output encoding, and using tools like OWASP ESAPI and HTML Purifier.
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