PHP Interview Question and Answers
PHP Interview Question and Answers: PHP (Hypertext Preprocessor) is a server-side scripting language primarily used for web development. It is open-source, which means that it is free to use, distribute and modify. PHP is designed to be embedded into HTML pages and can be used to create dynamic web pages, web applications, and interactive web content.
PHP Interview Question and Answers: It was initially created in 1994 by Rasmus Lerdorf and has since then evolved into a powerful programming language used by millions of developers worldwide. PHP code is executed on the server-side, which means that the end-user only sees the final output generated by the PHP code. PHP has a vast community of developers and a rich ecosystem of frameworks, libraries, and tools that make it easy to build robust and scalable web applications, Here we are Providing Important PHP Interview Question and Answers.
Question 1: What is PHP?
Answer: PHP is a server-side scripting language designed primarily for web development.
Question: What are the advantages of using PHP?
Answer: Some advantages of using PHP are:
- It is open-source and free to use
- It has a large and active community of developers
- It is easy to learn and use
- It can be embedded into HTML pages
- It can interact with databases and other technologies
- It can be used to build dynamic web applications
Question 2: What is the difference between GET and POST methods in PHP?
Answer: GET and POST are HTTP methods used to send data to a web server. GET sends data as part of the URL, while POST sends data in the body of the HTTP request. GET is commonly used for retrieving data, while POST is commonly used for submitting data, such as form submissions.
Question 3: What is the difference between include and require in PHP?
Answer: include and require are both used to include code from other PHP files. The difference is that require will stop the script if the included file is not found or if there is an error in the file, while include will only issue a warning and continue execution.
Question 4: What is a session in PHP?
Answer: A session in PHP is a way to store information about a user across multiple pages or requests. It allows you to keep track of a user’s information, such as login status or preferences, without having to pass that information in every URL or form submission.
Question 5: What is the difference between a cookie and a session in PHP?
Answer: A cookie is a small piece of data stored on a user’s computer, while a session is a way to store information on the server. Cookies are typically used to store user preferences or login information, while sessions are used to keep track of a user’s state across multiple pages or requests.
Question 6: What is the difference between mysqli and PDO in PHP?
Answer: mysqli and PDO are two extensions in PHP used for interacting with databases. mysqli is specific to MySQL databases, while PDO is a more generic database abstraction layer that can be used with multiple database types. PDO is often considered more flexible and secure, while mysqli may offer better performance with MySQL databases.
Question 7: What is object-oriented programming (OOP) in PHP?
Answer: OOP is a programming paradigm in PHP that involves using objects to represent data and functionality. It allows you to organize your code into reusable and modular components, making it easier to maintain and scale your codebase. OOP concepts in PHP include classes, objects, inheritance, encapsulation, and polymorphism.
Question 8: What is MVC in PHP?Answer: MVC (Model-View-Controller) is a design pattern commonly used in PHP web development. It separates the code into three main components: the Model, which represents the data and business logic; the View, which is responsible for displaying the data to the user; and the Controller, which handles user input and manages the flow of data between the Model and the View. This separation of concerns makes it easier to maintain and scale complex web applications.
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