Important Questions: Unit 3 – File Handling & OOP

Short Answer Questions (2-5 Marks)

1. What is the difference between include() and require() in PHP?
2. List any four file open modes in PHP with their descriptions.
3. What is Object-Oriented Programming (OOP)? Name four core principles of OOP.
4. What are access modifiers in PHP? Explain public, protected, and private with a comparison table.
5. What is a constructor in PHP? How does it differ from a destructor?
6. Define Encapsulation and Inheritance with one example each.

Long Answer Questions (10-15 Marks)

1. Explain PHP File Handling in detail. Describe fopen(), fread(), fwrite() and fclose() with their modes and code examples.
2. Explain the concept of Classes and Objects in PHP. Discuss: Class definition, Object creation, Properties, Methods, the $this keyword, Constructor, and Destructor. Include a complete code example.
3. Discuss Inheritance in PHP. Explain the types of inheritance supported (Single, Multilevel, Hierarchical), the extends keyword, method overriding, and the final keyword. Provide examples.
4. Describe the file uploading process in PHP step-by-step, covering the HTML form, the $_FILES superglobal, and the move_uploaded_file() function.