Take a look at some basic questions in PHP interviews (with answer analysis)

PHP is a very popular back-end programming language, and more and more people are starting to learn and use it. If you are nervous about preparing for an interview for a PHP position, don’t worry, let’s take a look at some basic PHP interview questions and answers.

1. What is PHP?

Answer: PHP is a server-side scripting language used to develop web applications. PHP source code can be executed on the server side, generating HTML and returning it to the client browser. PHP was originally developed by Rasmus Lerdorf and is now maintained and driven by the PHP developer community.

2. What can you do with PHP?

Answer: PHP can be used to develop many types of web applications, such as social media websites, blogs, e-commerce websites, content management systems, and more. PHP can also be used to process data collected from web forms, as well as manipulate and modify data in databases.

3. What is the relationship between PHP and HTML?

Answer: The relationship between HTML and PHP is complementary to each other. HTML is responsible for rendering web content, while PHP is responsible for generating HTML code. PHP can process data in the database and insert it into HTML for easy viewing by users.

4. What is the difference between $_GET and $_POST?

Answer: $_GET and $_POST are global variables of PHP, used to obtain data from web forms. The difference lies in the way data is passed. $_GET passes data through the URL, while $_POST submits data through the form. $_GET is used to obtain non-sensitive information, while $_POST is used to obtain sensitive information such as username and password, etc.

5. What is Session in PHP?

Answer: Session in PHP is a powerful mechanism for tracking the user's status in web applications. Session is a way of storing data on the server. When a user browses a website, the web server generates a unique Session ID to track the user's session information. The Session ID can be stored in a cookie or passed using URL rewriting techniques.

6. Explain what is MVC?

Answer: MVC is the abbreviation of Model-View-Controller and is an architectural pattern for designing web applications. Models are responsible for handling data in the application, views are responsible for rendering web pages, and controllers are used to handle user interaction. Another important aspect of the MVC pattern is the separation of application logic and presentation logic. By using the MVC pattern, it is easier to manage the application's code, making the application more maintainable.

7. What are the changes in PHP7 compared to PHP5?

Answer: PHP7 has many important improvements compared to PHP5. Among the most significant improvements are performance improvements. PHP7 uses the new Zend engine 3.0, which optimizes memory allocation and management, making the code run faster. In addition, PHP7 also introduces more new features, such as scalar type declaration, return type declaration, null coalescing operator, etc., making the coding easier to read and maintain.

The above are some basic questions and answers in PHP interviews. I hope they can help PHP developers who are preparing for interviews.

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