Question 1

What symbol is used to declare a variable in PHP?

Accepted Answer

$

Answer

!

Answer

@

Answer

&

Question 2

Which of the following is a valid PHP variable name?

Accepted Answer

$my_var

Answer

1var

Answer

my var

Answer

my-var

Question 3

What is the type of variable in PHP that can store multiple values?

Accepted Answer

array

Answer

integer

Answer

string

Answer

float

Question 4

What PHP function is used to see the data type and value of a variable?

Accepted Answer

var_dump

Answer

print

Answer

echo

Answer

printf

Question 5

What is the difference between $x=10; and $x==10; in PHP?

Accepted Answer

$x=10; assigns the value 10 to $x, whereas $x==10; checks if $x is equal to 10.

Answer

$x=10; checks if $x is equal to 10, whereas $x==10; assigns the value 10 to $x.

Answer

$x=10; and $x==10; are both invalid syntax in PHP.

Answer

There is no difference

Question 6

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

Accepted Answer

== compares the values of two variables, whereas === compares the values and data types of two variables.

Answer

== and === operators are equivalent in PHP.

Answer

== is used for assigning values to a variable, whereas === is used for comparing variables.

Answer

== compares the data types of two variables, whereas === compares the values of two variables.

Question 7

What is the result of adding a string and a number in PHP?

Accepted Answer

The number is treated as a string and concatenated to the original string.

Answer

The number is rounded to the nearest integer and concatenated to the original string.

Answer

The string is treated as a number and added to the original number.

Answer

An error is thrown

Question 8

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

Accepted Answer

define('MY_CONSTANT', 'Hello World');

Answer

$MY_CONSTANT = 'Hello World';

Answer

const MY_CONSTANT = 'Hello World';

Answer

def MY_CONSTANT = 'Hello World';

Question 9

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

Accepted Answer

require() will produce a fatal error and stop the script if the file is not found, whereas include() will only produce a warning and continue the script.

Answer

include() is used to execute a function, whereas require() is used to include a file.

Answer

require() is used to execute a function, whereas include() is used to include a file.

Answer

There is no difference between require() and include() functions in PHP.

Question 10

What keyword is used in PHP to define a constant?

Accepted Answer

define()

Answer

const

Answer

var

Answer

let

Question 11

Which of the following statements is true about PHP constants?

Accepted Answer

Once defined, constants can not be changed or redefined

Answer

Constants can only be defined within a class

Answer

Constants can be changed or redefined any number of times

Answer

Constants can only hold numerical values

Question 12

What is the correct way to define a constant with a case-insensitive name in PHP?

Accepted Answer

define('MY_CONSTANT', 'value', true);

Answer

define('MY_CONSTANT', 'value', false);

Answer

define('my_constant', 'value', false);

Answer

define('my_constant', 'value', true);

Question 13

What is the purpose of using PHP constants?

Accepted Answer

To store values that do not change during the execution of a script

Answer

To store dynamic values generated by user input

Answer

To store values that change frequently during script execution

Answer

To store sensitive data such as passwords

Question 14

What is the scope of a PHP constant?

Accepted Answer

Global

Answer

Class

Answer

Function

Answer

Local

Question 15

What is the naming convention for PHP constants?

Accepted Answer

All caps with underscores between words (e.g. MY_CONSTANT)

Answer

CamelCase with leading lowercase letter (e.g. myConstant)

Answer

Lowercase with hyphens between words (e.g. my-constant)

Answer

PascalCase with leading uppercase letter (e.g. MyConstant)

Question 16

What is the difference between PHP constants and PHP variables?

Accepted Answer

Constants hold values that can not be changed or redefined, while variables can hold any value that can be reassigned

Answer

Variables are global while constants are local

Answer

Constants are defined using the $ symbol while variables are not

Answer

There is no difference, they can be used interchangeably

Question 17

Which keyword is used to check if a constant has been defined in PHP?

Accepted Answer

defined()

Answer

isset()

Answer

const()

Answer

check()

Question 18

What is the data type of a PHP constant?

Accepted Answer

Scalar

Answer

Object

Answer

Array

Answer

Resource

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