PHP Constants Quiz

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Questions and Answers

What is a defining feature of a PHP constant?

A constant can change its value during execution.
A constant can only contain string values.
A constant is defined with a variable prefix.
A constant must be defined using the 'define' function. (correct)

Which of the following statements about PHP constants is true?

Constants can be defined inside functions only.
Constants cannot be defined in a class context.
Once defined, constants cannot be undefined. (correct)
Constants are case-insensitive by default.

How do you define a constant in PHP?

constant('NAME', 'value');
define('NAME', 'value'); (correct)
const NAME = 'value';
set_constant('NAME', 'value');

Which data types can a PHP constant hold?

<p>Any scalar value including integers, floats, and strings. (B)</p> Signup and view all the answers

What is the significance of using uppercase letters when naming constants in PHP?

<p>It indicates that they should not be altered. (B)</p> Signup and view all the answers

Flashcards

Unchangeable nature of Constants

Constants cannot be reassigned or modified after they are declared.

How to define a constant

The define() function is used to declare a new constant in PHP.

Data types for constants

Constants can hold various scalar data types like integers, floats, and strings.

Why use uppercase for constants

Using uppercase letters for constant names in PHP is a convention that indicates they are not meant to be changed.

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Defining a PHP constant

Constants in PHP are declared with the define() function in the format define('CONSTANT_NAME', 'value');.

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Study Notes

PHP Constants

PHP constants are immutable, meaning they cannot be changed once defined.
Constants are defined using the define() function.
The syntax is: define('CONSTANT_NAME', 'VALUE');.
Constants can hold any data type, including strings, integers, floats, booleans, and arrays.
Using uppercase letters for constant names is a widely adopted convention in PHP to distinguish them from variables, improving code readability and maintainability.

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Description

Test your knowledge on PHP constants with this quiz. Explore defining features, naming conventions, and the data types associated with constants in PHP. Perfect for developers looking to reinforce their understanding of constant usage in PHP programming.