Backend DevelopmentPHP TutorialHow to limit the number of retrieved rows in various databases? _PHP TutorialHow to limit the number of retrieved rows in various databases? _PHP Tutorial
Currently there are only three databases known to implement this function!
mysql:select * from table limit 10
ORACLE:select * from table where rowidmsSQL:select top 10 from table
Explain how load balancing affects session management and how to address it.Apr 29, 2025 am 12:42 AMLoad balancing affects session management, but can be resolved with session replication, session stickiness, and centralized session storage. 1. Session Replication Copy session data between servers. 2. Session stickiness directs user requests to the same server. 3. Centralized session storage uses independent servers such as Redis to store session data to ensure data sharing.
Explain the concept of session locking.Apr 29, 2025 am 12:39 AMSessionlockingisatechniqueusedtoensureauser'ssessionremainsexclusivetooneuseratatime.Itiscrucialforpreventingdatacorruptionandsecuritybreachesinmulti-userapplications.Sessionlockingisimplementedusingserver-sidelockingmechanisms,suchasReentrantLockinJ
Are there any alternatives to PHP sessions?Apr 29, 2025 am 12:36 AMAlternatives to PHP sessions include Cookies, Token-based Authentication, Database-based Sessions, and Redis/Memcached. 1.Cookies manage sessions by storing data on the client, which is simple but low in security. 2.Token-based Authentication uses tokens to verify users, which is highly secure but requires additional logic. 3.Database-basedSessions stores data in the database, which has good scalability but may affect performance. 4. Redis/Memcached uses distributed cache to improve performance and scalability, but requires additional matching
Define the term 'session hijacking' in the context of PHP.Apr 29, 2025 am 12:33 AMSessionhijacking refers to an attacker impersonating a user by obtaining the user's sessionID. Prevention methods include: 1) encrypting communication using HTTPS; 2) verifying the source of the sessionID; 3) using a secure sessionID generation algorithm; 4) regularly updating the sessionID.
What is the full form of PHP?Apr 28, 2025 pm 04:58 PMThe article discusses PHP, detailing its full form, main uses in web development, comparison with Python and Java, and its ease of learning for beginners.
How does PHP handle form data?Apr 28, 2025 pm 04:57 PMPHP handles form data using $\_POST and $\_GET superglobals, with security ensured through validation, sanitization, and secure database interactions.
What is the difference between PHP and ASP.NET?Apr 28, 2025 pm 04:56 PMThe article compares PHP and ASP.NET, focusing on their suitability for large-scale web applications, performance differences, and security features. Both are viable for large projects, but PHP is open-source and platform-independent, while ASP.NET,
Is PHP a case-sensitive language?Apr 28, 2025 pm 04:55 PMPHP's case sensitivity varies: functions are insensitive, while variables and classes are sensitive. Best practices include consistent naming and using case-insensitive functions for comparisons.
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