Top PHP Advanced Interview Questions

Sure, here are 50 PHP advanced interview questions:

1. What is the difference between abstract classes and interfaces?
2. What is late static binding and how does it work in PHP?
3. What is a closure in PHP and when would you use one?
4. What is a generator in PHP and how does it work?
5. What is a trait in PHP and how is it different from a class or interface?
6. What is dependency injection and how does it work in PHP?
7. What is the purpose of the SPL (Standard PHP Library) in PHP?
8. What is the difference between the array_merge and array_combine functions in PHP?
9. What is the difference between the isset() and empty() functions in PHP?
10. What is the difference between public, private, and protected in PHP classes?
11. What is the difference between static and dynamic binding in PHP?
12. What is the difference between the double arrow (->) and the scope resolution (::) operators in PHP?
13. What is the difference between a cookie and a session in PHP?
14. How do you declare a constant in PHP?
15. How do you use namespaces in PHP?
16. How do you use traits in PHP?
17. What is a PDO (PHP Data Object) and why would you use one?
18. What is a prepared statement in PHP and why is it important for database security?
19. What is a closure and how is it used in PHP?
20. What is a PSR (PHP Standards Recommendation) and why is it important?
21. What is the difference between a GET request and a POST request in PHP?
22. How do you handle errors and exceptions in PHP?
23. What is an autoloader in PHP and how does it work?
24. What is the purpose of the __autoload function in PHP?
25. What is the difference between require and include in PHP?
26. How do you define a class in PHP?
27. What is the difference between public, protected, and private properties in PHP classes?
28. What is a static property or method in PHP?
29. What is the purpose of the spl_autoload_register function in PHP?
30. What is a magic method in PHP and how do you use it?
31. What is the purpose of the session_start() function in PHP?
32. What is a PHP extension and how do you create one?
33. What is the purpose of the Reflection API in PHP?
34. What is a closure in PHP and how is it used?
35. What is the purpose of the magic constants FILE and LINE in PHP?
36. What is the difference between the array() and [] syntax in PHP?
37. How do you use the use keyword in PHP closures?
38. What is a recursive function in PHP and how does it work?
39. What is a static method in PHP and how do you use it?
40. How do you use the PHP filter_var() function?
41. What is the difference between the json_encode() and json_decode() functions in PHP?
42. How do you implement an interface in PHP?
43. How do you use the yield keyword in PHP?
44. What is the difference between the list() function and array destructuring in PHP?
45. How do you handle file uploads in PHP?
46. What is the difference between the == and === operators in PHP?
47. How do you use the ternary operator in PHP?
48. What is a type hint in PHP and how is it used?
49. What is the difference between the return and echo statements in PHP?
50. How do you use the array_reduce() function in PHP?

Good luck with your interview!