PHP Data Types MCQ Questions and Answers

1. Which of the following is a scalar data type in PHP?

a) Array

b) Object

c) Boolean

d) NULL

Answer:

c) Boolean

Explanation:

Boolean is a scalar data type in PHP, representing two possible values: true or false.

2. What data type is used for textual data in PHP?

a) String

b) Char

c) Text

d) Varchar

Answer:

a) String

Explanation:

In PHP, textual data is represented as a string.

3. Which of the following is a compound data type in PHP?

a) Integer

b) Float

c) Array

d) Boolean

Answer:

c) Array

Explanation:

Array is a compound data type in PHP, which can hold multiple values of different data types.

4. How is an integer value defined in PHP?

a) Int 10

b) 10

c) "10"

d) 10.0

Answer:

b) 10

Explanation:

Integers in PHP are non-decimal numbers without any quotes.

5. What is the correct way to define a floating-point number in PHP?

a) 1.234

b) "1.234"

c) float(1.234)

d) 1234e-3

Answer:

a) 1.234

Explanation:

A floating-point number in PHP is defined as a number with a decimal point.

6. How is a Boolean TRUE value represented in PHP?

a) 1

b) TRUE

c) true

d) All of the above

Answer:

d) All of the above

Explanation:

In PHP, a Boolean TRUE value can be represented as 1, TRUE, or true.

7. What data type does the following PHP variable belong to: $var = "Hello World!";

a) String

b) Integer

c) Float

d) Array

Answer:

a) String

Explanation:

The variable $var is a string because it contains textual data enclosed in quotes.

8. Which of the following data types does not exist in PHP?

a) Double

b) Short

c) Integer

d) NULL

Answer:

b) Short

Explanation:

PHP does not have a data type called Short. It supports Integer, Double, and NULL.

9. What is the data type of a variable that has been assigned the value NULL in PHP?

a) String

b) Integer

c) NULL

d) Boolean

Answer:

c) NULL

Explanation:

A variable that is assigned the value NULL belongs to the NULL data type.

10. In PHP, what data type is an associative array?

a) String

b) Array

c) Object

d) Resource

Answer:

b) Array

Explanation:

Both indexed and associative arrays in PHP are of the Array data type.

11. Which of the following is a special data type in PHP?

a) Resource

b) Constant

c) Function

d) Variable

Answer:

a) Resource

Explanation:

The Resource type in PHP is a special data type used to store references to external resources.

12. How does PHP treat variables of type Integer and Float during arithmetic operations?

a) It converts integers to floats

b) It converts floats to integers

c) It throws an error

d) It depends on the operation

Answer:

a) It converts integers to floats

Explanation:

PHP automatically converts integers to floats as needed during arithmetic operations.

13. What is the output of var_dump(is_int(25.5)) in PHP?

a) true

b) false

c) 1

d) NULL

Answer:

b) false

Explanation:

is_int() checks whether a variable is of type integer. 25.5 is a float, not an integer.

14. Which of the following values is considered FALSE in PHP?

a) 0

b) "0"

c) []

d) All of the above

Answer:

d) All of the above

Explanation:

In PHP, 0, "0", and an empty array are considered as FALSE in a Boolean context.

15. What is the result of gettype(12345.678) in PHP?

a) "Integer"

b) "Double"

c) "Float"

d) "Numeric"

Answer:

b) "Double"

Explanation:

In PHP, floating-point numbers are considered as type "Double".