PHP – Interview Questions Guide

1. What is PHP?
2. How do you install PHP?
3. What are the basic syntax rules in PHP?
4. How do you declare a variable in PHP?
5. What are the data types in PHP?
6. How can you concatenate strings in PHP?
7. Explain the difference between == and === in PHP?
8. What is the purpose of the $_GET and $_POST arrays in PHP?
9. How do you connect to a MySQL database in PHP?
10. What is the use of the session in PHP?
11. Explain the difference between include and require in PHP?
12. What is an autoloader in PHP?
13. How can you handle file uploads in PHP?
14. Explain the concept of namespaces in PHP?
15. What is Composer, and how is it used in PHP?
16. How does PHP differ from other programming languages?
17. Can you explain the difference between a variable and a constant in PHP?
18. What is the opening and closing tags used in PHP?
19. How do you comment code in PHP?
20. Explain the use of the semicolon in PHP.
21. What are the different data types supported by PHP?
22. How do you declare and initialize a variable in PHP?
23. What is the difference between single quotes and double quotes for string literals?
24. What are the various types of loops in PHP?
25. How does the “if-else” statement work in PHP?
26. Can you explain the “switch” statement in PHP?
27. How do you define a function in PHP?
28. What is the purpose of parameters and return values in a function?
29. Explain the difference between “echo” and “return” in PHP functions.
30. How do you create an array in PHP?
31. What is the difference between indexed and associative arrays?
32. Can you demonstrate how to loop through an array in PHP?
33. How do you open and read from a file in PHP?
34. Explain the process of writing data to a file using PHP.
35. What is the purpose of the “file_exists” function in PHP?
36. How does PHP handle errors and exceptions?
37. What is the purpose of the “try-catch” block in PHP?
38. How can you display detailed error messages during development without exposing them in production?
39. How do you connect to a database in PHP?
40. Explain the difference between SQL injection and prepared statements.
41. What is the purpose of the PDO extension in PHP?
42. What are some common security vulnerabilities in PHP applications?
43. How can you sanitize user input to prevent security issues?
44. Explain the concept of session management in PHP?

-Thank you, happy coding !!