41. What is the output of echo 0 == 'false';?
- a) 1 (true)
- b) 0 (false)
- c) Error
- d) 'false'
Answer: A - Loose comparison converts 'false' to 0, making 0 == 0 true.
42. Which function returns the current Unix timestamp?
- a) time()
- b) date()
- c) now()
- d) timestamp()
Answer: A - time() returns current Unix timestamp (seconds since Jan 1 1970).
43. What is the correct way to declare a namespace in PHP?
- a) namespace MyProject;
- b) use MyProject;
- c) \namespace MyProject;
- d) #namespace MyProject
Answer: A - Namespaces are declared with the
namespace keyword at the file's top.
44. Which function removes duplicate values from an array?
- a) array_unique()
- b) array_distinct()
- c) remove_duplicates()
- d) unique_array()
Answer: A - array_unique() removes duplicate values (keeps first occurrence).
45. What is the correct way to handle exceptions in PHP?
- a) try/catch blocks
- b) on_error()
- c) exception_handle()
- d) @ operator
Answer: A - Exceptions are handled using try/catch blocks.
46. Which function reverses a string?
- a) strrev()
- b) reverse()
- c) str_reverse()
- d) string_reverse()
Answer: A - strrev() reverses a string (e.g., "hello" → "olleh").
47. What does the === operator check?
- a) Value and type equality
- b) Only value equality
- c) Only type equality
- d) Reference equality
Answer: A -
=== checks both value and type (strict comparison).
48. Which function converts a string to an array?
- a) explode()
- b) str_split()
- c) split()
- d) Both A and B
Answer: D - Both explode() (by delimiter) and str_split() (by length) convert strings to arrays.
49. What is the correct way to include a file in PHP?
- a) include 'file.php';
- b) require 'file.php';
- c) include_once 'file.php';
- d) All of the above
Answer: D - All are valid, with different behaviors on failure and multiple inclusions.
50. Which function checks if a variable is an array?
- a) is_array()
- b) isArray()
- c) typeOf()
- d) gettype()
Answer: A - is_array() checks if a variable is an array.
51. What is the correct way to create a cookie?
- a) setcookie(name, value, expire);
- b) create_cookie(name, value);
- c) cookie(name, value, expire);
- d) make_cookie(name, value);
Answer: A - setcookie() is used to create cookies in PHP.
52. Which function returns the keys of an array?
- a) array_keys()
- b) keys()
- c) get_keys()
- d) array_key_list()
Answer: A - array_keys() returns all keys or a subset of keys from an array.
53. What is the correct way to create a class in PHP?
- a) class MyClass { }
- b) object MyClass { }
- c) new class MyClass { }
- d) create class MyClass { }
Answer: A - Classes are declared with the
class keyword.
54. Which function formats a local time/date?
- a) date()
- b) time()
- c) format_date()
- d) localtime()
Answer: A - date() formats a timestamp (defaults to current time).
55. What is the correct way to create an object?
- a) new ClassName()
- b) create ClassName()
- c) object ClassName()
- d) ClassName.create()
Answer: A - Objects are instantiated with the
new keyword.
56. Which function checks if a file exists?
- a) file_exists()
- b) is_file()
- c) exists()
- d) check_file()
Answer: A - file_exists() checks whether a file or directory exists.
57. What is the correct way to sort an array in descending order?
- a) rsort()
- b) arsort()
- c) krsort()
- d) All of the above
Answer: D - All sort in descending order (rsort: values, arsort: associative by values, krsort: associative by keys).
58. Which function returns the number of array elements?
- a) count()
- b) sizeof()
- c) length()
- d) Both A and B
Answer: D - Both count() and sizeof() return the number of elements (aliases).
59. What is the correct way to read a JSON file?
- a) json_decode(file_get_contents('file.json'))
- b) read_json('file.json')
- c) file_read('file.json', 'json')
- d) json_read('file.json')
Answer: A - file_get_contents() reads the file, json_decode() parses JSON.
60. Which function executes a prepared PDO statement?
- a) execute()
- b) run()
- c) query()
- d) pdo_exec()
Answer: A - The execute() method runs a prepared PDO statement.