PHP Interview Questions

20. What are the features and advantages of object-oriented programming?

21. What are the differences between procedure-oriented languages and object-oriented languages?

22. What is the use of friend function?

23. What are the differences between public, private, protected, static, transient, final and volatile?

24. What are the different types of errors in PHP?

25. What is the functionality of the function strstr and stristr?

26. What are the differences between PHP 3 and PHP 4 and PHP 5?

27. How can we convert asp pages to PHP pages?

28. What is the functionality of the function htmlentities?

29. How can we get second of the current time using date function?

30. How can we convert the time zones using PHP?

31. What is meant by urlencode and urldocode?

32. What is the difference between the functions unlink and unset?

33. How can we register the variables into a session?

34. How can we get the properties (size, type, width, height) of an image using PHP image functions?

35. How can we get the browser properties using PHP?

36. What is the maximum size of a file that can be uploaded using PHP and how can we change this?

37. How can we increase the execution time of a PHP script?

38. How can we take a backup of a mysql table and how can we restore it. ?

39. How can we optimize or increase the speed of a mysql select query?