Top 50 PHP Interview Questions with Answers

PHP Interview Questions with Answers

1. What does PHP stand for?

A. Personal Home Page
B. Preprocessor Hypertext
C. PHP Hypertext Processor
D. PHP Hyper Page

Answer: C

2. Which of the following is not a valid PHP variable name?

A. $my_var
B. $bar
C. $1var
D. $hey_hey

Answer: C

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

A. $GLOBALS
B. $my_var
C. $local
D. $x_variable

Answer: A

4. Which of the following functions is used to connect to a MySQL database?

A. mysql_connect()
B. php_connect()
C. connect_mysql()
D. mysqli_connect()

Answer: D

5. What is the difference between a GET and a POST method in PHP?

A. GET sends data as a URL parameter, while POST sends data behind the scenes.
B. POST sends data as a URL parameter, while GET sends data behind the scenes.
C. There is no difference.
D. GET and POST cannot be used in PHP.

Answer: A

6. Which of the following is true about PHP arrays?

A. Arrays must be declared with a specific size.
B. Arrays can only hold one data type.
C. Arrays are dynamic and can hold multiple data types.
D. Arrays can only be used with numeric indexes.

Answer: C

7. What is the difference between echo and print in PHP?

A. There is no difference.
B. print can only output strings, while echo can output anything.
C. echo can only output strings, while print can output anything.
D. echo and print are not used in PHP.

Answer: B

8. Which of the following is used to start a PHP session?

A. session_start()
B. session_begin()
C. start_session()
D. session()

Answer: A

9. Which of the following filter is used to validate an email address?

A. FILTER_VALIDATE_IP
B. FILTER_VALIDATE_URL
C. FILTER_VALIDATE_EMAIL
D. FILTER_VALIDATE_DATE

Answer: C

10. What is the function used to remove white spaces from the beginning and end of a string?

A. trim()
B. strip()
C. clean()
D. clear()

Answer: A

11. Which of the following is used to upload files in PHP?

A. upload_files()
B. upload()
C. move_uploaded_file()
D. file_upload()

Answer: C

12. Which of the following is not a PHP loop structure?

A. for loop
B. while loop
C. do-while loop
D. switch loop

Answer: D

13. Which of the following is used to insert data into a MySQL database?

A. mysqli_select()
B. mysqli_query()
C. mysqli_delete()
D. mysqli_insert()

Answer: B

14. Which of the following is used to include a file in PHP?

A. include()
B. require()
C. require_once()
D. All of the above

Answer: D

15. Which of the following is used to check if a file exists in PHP?

A. file_exist()
B. file_check()
C. file_exists()
D. file()

Answer: C

16. What is the difference between == and === operators in PHP?

A. There is no difference.
B. == is used for comparison, while === is used for assignment.
C. == is used for assignment, while === is used for comparison.
D. == compares both value and data type, while === compares only value.

Answer: D

17. Which of the following is used to return a random number in PHP?

A. rand()
B. random()
C. random_number()
D. number_rand()

Answer: A

18. Which of the following is used to create a function in PHP?

A. function_create()
B. function_make()
C. function()
D. create_function()

Answer: D

19. Which of the following can be used to add elements to the end of an array?

A. array_add()
B. array_push()
C. array_append()
D. array_insert()

Answer: B

20. Which of the following is used to redirect a user to another page in PHP?

A. header()
B. redirect()
C. go_to()
D. forward()

Answer: A

21. What is the scope of a variable in PHP?

A. The part of the program where the variable is accessible.
B. The part of the program where the variable is declared.
C. A variable has no scope.
D. A variable scope depends on its data type.

Answer: A

22. Which of the following is used to count the number of elements in an array in PHP?

A. count()
B. length()
C. size()
D. total()

Answer: A

23. Which of the following is used to convert a string to all uppercase letters in PHP?

A. to_upper()
B. uppercase()
C. strtoupper()
D. upcase()

Answer: C

24. What is a PHP constant?

A. A variable that can be changed.
B. A variable that cannot be changed.
C. A loop structure in PHP.
D. A conditional statement in PHP.

Answer: B

25. Which of the following is used to sort an array in alphabetical order in PHP?

A. sort()
B. sort_alphabetical()
C. asort()
D. rsort()

Answer: A

26. Which of the following is used to remove a specific element from an array in PHP?

A. array_remove()
B. array_delete()
C. unset()
D. remove()

Answer: C

27. Which of the following is used to read the contents of a file into a string in PHP?

A. file_string()
B. file_contents()
C. read_file()
D. file_get_contents()

Answer: D

28. Which of the following is used to check if a variable is empty in PHP?

A. empty()
B. is_empty()
C. isnull()
D. isempty()

Answer: A

29. Which of the following is used to round a number to the nearest whole number in PHP?

A. ceil()
B. floor()
C. round()
D. round_number()

Answer: C

30. How do you declare a multi-dimensional array in PHP?

A. $array[][] = value;
B. $array[][][];
C. $array[][];
D. $array[][] = value;

Answer: D

31. Which of the following is used to set the timezone in PHP?

A. timezone_set()
B. timezone()
C. date_default_timezone()
D. date_timezone_set()

Answer: C

32. Which of the following is used to convert a string to a date in PHP?

A. string_to_date()
B. date_create()
C. strtotime()
D. date()

Answer: C

33. Which of the following is used to open a file in PHP?

A. fopen()
B. open_file()
C. file_open()
D. file()

Answer: A

34. Which of the following is used to download a file in PHP?

A. download()
B. file_download()
C. header()
D. fopen()

Answer: C

35. What does the strlen() function do in PHP?

A. Calculates the size of a file.
B. Counts the number of lines in a file.
C. Calculates the length of a string.
D. Calculates the size of an array.

Answer: C

36. Which of the following is used to check if a variable is an array in PHP?

A. isarray()
B. is_array()
C. array_check()
D. check_array()

Answer: B

37. Which of the following is used to calculate the remainder of a division in PHP?

A. mod()
B. modulo()
C. division()
D. %

Answer: D

38. Which of the following is used to get the current date in PHP?

A. date()
B. time()
C. datetime()
D. getdate()

Answer: A

39. Which of the following is used to get the current time in PHP?

A. date()
B. time()
C. datetime()
D. gettime()

Answer: B

40. Which of the following is used to compare two strings in PHP?

A. strcompare()
B. strcmp()
C. compare()
D. string_compare()

Answer: B

41. Which of the following is used to check if a string contains another string in PHP?

A. str_contains()
B. strstr()
C. compare()
D. string_compare()

Answer: B

42. Which of the following is used to get the last character of a string in PHP?

A. end()
B. last_char()
C. last()
D. substr()

Answer: D

43. Which of the following is used to convert an array into a string in PHP?

A. implode()
B. array_to_string()
C. convert()
D. to_string()

Answer: A

44. Which of the following is used to generate a random string in PHP?

A. rand_string()
B. string_rand()
C. random_str()
D. str_rand()

Answer: D

45. Which of the following is used to remove duplicate values from an array in PHP?

A. unique()
B. array_unique()
C. remove_duplicates()
D. deduplicate()

Answer: B

46. What is the default maximum execution time for a PHP script?

A. 30 seconds
B. 60 seconds
C. 90 seconds
D. 120 seconds

Answer: B

47. Which of the following is used to convert a boolean value to a string in PHP?

A. str_boolean()
B. booltostr()
C. tostring()
D. strbool()

Answer: C

48. Which of the following is used to calculate the absolute value of a number in PHP?

A. abs()
B. absolute()
C. number_abs()
D. get_absolute()

Answer: A

49. What is the difference between require() and include() in PHP?

A. There is no difference.
B. include() returns a warning if the file is not found, while require() returns an error.
C. require() returns a warning if the file is not found, while include() returns an error.
D. require() and include() cannot be used in PHP.

Answer: B

50. What is a PHP namespace?

A. A container for functions and variables.
B. A way to organize code into logical groups.
C. A loop structure in PHP.
D. A conditional statement in PHP.

Answer: B

Ashwani Kumar
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