Cognizant · PHP

Cognizant PHP interview questions

Practice PHP questions specifically asked in Cognizant interviews – ideal for online test preparation, technical rounds and final HR discussions.

Company: CognizantSubject: PHP55 questions in this page

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Cognizant · PHP questions (55)

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1. Which function returns the number of elements in an array?

Difficulty: EasyType: MCQTopic: Array Ops

The count() function returns the number of elements in an array or object implementing Countable.

Example code

count($arr);

2. Which two functions convert between arrays and strings?

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Cognizant PHP interview questions

Quick overview

1. Which function returns the number of elements in an array?

2. Which two functions convert between arrays and strings?

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3. Which function writes data directly to a file without opening it manually?

4. What does PDO stand for in PHP?

5. What is the factorial of 5?

6. What is the purpose of OPCache in PHP?

7. What does PHP’s garbage collector do?

8. What does the nullsafe operator ( ?-> ) do in PHP 8?

9. Which new PHP 8 function checks if a string contains another substring?

10. In which file are web routes defined in a Laravel application?

11. Which operator can check if a number is even or odd in PHP?

12. What keyword is used to exit a switch statement in PHP?

13. Which function is used to control which PHP errors are reported?

14. What is method overriding in PHP?

15. Which method retrieves rows from a PDO statement as an associative array?

16. Which superglobal is used to access session variables?

17. Which superglobal retrieves cookie data in PHP?

18. What is the name of the function automatically called when an object is created?

19. Which HTTP method sends form data through the URL?

20. What does the PHP superglobal $_REQUEST contain?

21. Which function is used to set a cookie in PHP?

22. How do you delete a cookie in PHP?

23. How can you count the total number of elements in an array?

24. What does the keyword $this refer to inside a class method?

25. Which loop checks the condition before executing the block?

26. Which function executes an SQL query in MySQLi?

27. Which loop is used to iterate through arrays easily in PHP?

28. Why are prepared statements used in PHP?

29. How can you define a default parameter value in PHP?

30. Which function returns the length of a string in PHP?

31. Which of the following can be used to create an array in PHP?

32. Which symbol is used to start a variable in PHP?

33. Which of the following is NOT a valid PHP data type?

34. Which function is used to define a constant in PHP?

35. Which of the following is a PHP superglobal variable?

36. What is the base class for all exceptions in PHP?

37. How do you create a custom exception in PHP?

38. What does the mode 'a' mean in fopen?

39. Which function writes data into a file in PHP?

40. Which PHP function is used to delete a file?

41. Where are PHP session files usually stored by default?

42. Which of the following is the main purpose of authentication?

43. Which function is used to convert a PHP array into a JSON string?

44. Which HTTP method is typically used to update existing data on a server?

45. What does the PHP header() function do?

46. Which PHP feature automatically loads classes when they are needed?

47. Which PHP 8 feature allows specifying multiple possible data types for a parameter?

48. What is a Service Provider in Laravel?

49. What are attributes in PHP 8 used for?

50. How can PHP applications protect against CSRF attacks?

51. What does MVC stand for in Laravel?

52. What are migrations in Laravel used for?

53. Which PHP function should be used to securely store user passwords?

54. What is a good practice for error display in production?

55. What is the purpose of an API key in web applications?

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