15+ Comprehensive MCQ on Variables in PHP: Unlocking the Power of Variable Mastery

Before looking MCQ on Variables in PHP we first know what is Variable in PHP. Variables in PHP are used to store and manipulate data. Understanding how to declare, assign values to, and use variables are fundamental to PHP programming.

Explanation of Variables in PHP

Variable Declaration:

• In PHP, variables are declared using a dollar sign ($) followed by the variable name.
• Variable names must start with a letter or an underscore (_) and can be followed by letters, numbers, or underscores.
• Variable names are case-sensitive, meaning $var, $Var, and $VAR are treated as distinct variables.

Variable Assignment:

• Variables are assigned values using the assignment operator (=).
• PHP is a loosely typed language, so variables do not require explicit declaration of data types.
• The data type of a variable is determined by the type of value assigned to it.

Data Types in PHP:

• PHP supports various data types, including integers, floats (floating-point numbers), strings, booleans, arrays, objects, and resources.
• Integer and float variables can store numeric values.
• String variables can store sequences of characters enclosed in single quotes (”) or double quotes (“”).
• Boolean variables can store either true or false.
• Arrays are used to store multiple values in a single variable.

Variable Scope:

• PHP variables have three main scopes: global, local, and static.
• Global variables are defined outside of any function and can be accessed from anywhere in the script.
• Local variables are defined inside functions and are accessible only within the function where they are declared, unless explicitly declared as global.
• Static variables retain their value between function calls.

Variable Output:

• The value of a variable can be output using the echo or print statements.
• Variables can be concatenated with strings using the dot (.) operator in PHP.
• Alternatively, variables can be directly embedded within double-quoted strings for interpolation.

MCQ on Variables in PHP

How do you declare a variable in PHP?

1. Using the var keyword
2. Using the variable keyword
3. Using the $ symbol followed by the variable name
4. Using the let keyword

Correct Answer: 3. Using the $ symbol followed by the variable name

Which of the following variable names is invalid in PHP?

1. $myVariable
2. $_myVariable
3. $1stVariable
4. $my_Variable

Correct Answer 3. $1stVariable

How do you assign a value of 10 to a variable named $x in PHP?

1. $x = 10;
2. 10 = $x;
3. $x := 10;
4. let $x = 10;

Correct Answer 1. $x = 10;

What is the result of echo “Hello, ” . “world!”; in PHP?

1. Hello, world!
2. Hello,
3. world!
4. Hello, world! (with a space)

Correct Answer 1. Hello, world!

Which of the following is a valid way to define a string variable in PHP?

1. $str = ‘Hello’;
2. $str = “Hello”;
3. $str = Hello;
4. Both A and B

Correct Answer 4. Both A and B

What is the default value of an uninitialized variable in PHP?

1. null
2. 0
3. false
4. Undefined

Correct Answer 1. null

What is the correct way to concatenate two variables $a and $b in PHP?

1. $a + $b
2. $a & $b
3. $a . $b
4. $a : $b

Correct Answer 3. $a . $b

How do you check the data type of a variable in PHP?

1. Using the typeof operator
2. Using the getType() function
3. PHP does not support checking variable types
4. Using the typeof() function

Correct Answer 2. Using the getType() function

What is the scope of a variable declared inside a function in PHP?

1. Global
2. Local
3. Static
4. Constant

Correct Answer 2. Local

Which of the following is a valid way to start a variable name in PHP?

1. $1variable
2. $variable1
3. $*variable
4. $variable_1

Correct Answer 2. $variable1

How do you assign a boolean value of true to a variable in PHP?

1. $var = True;
2. $var = true;
3. $var = 1;
4. $var = “true”;

Correct Answer 2. $var = true;

What is the value of a variable $x after the following code executes: $x = 5; $x += 2;?

1. 2
2. 5
3. 7
4. 10

Correct Answer 3. 7

What is the scope of a variable declared outside of any function in PHP?

1. Global
2. Local
3. Static
4. Constant

Correct Answer 1. Global

If you want to become a perfect developer, you must know the concept of Session in PHP.

What is the correct syntax to define a string variable containing the text “Hello, World!” in PHP?

1. $str = ‘Hello, World!’;
2. $str = “Hello, World!”;
3. $str = Hello, World!;
4. Both A and B

Correct Answer 4. Both A and B

Which of the following is a valid variable name in PHP?

1. $my variable
2. $my_variable
3. $my-variable
4. $1stVariable

Correct Answer 2. $my_variable

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