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Questions and Answers
What is a defining feature of a PHP constant?
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?
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?
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?
Which data types can a PHP constant hold?
What is the significance of using uppercase letters when naming constants in PHP?
What is the significance of using uppercase letters when naming constants in PHP?
Flashcards
Unchangeable nature of Constants
Unchangeable nature of Constants
Constants cannot be reassigned or modified after they are declared.
How to define a constant
How to define a constant
The define() function is used to declare a new constant in PHP.
Data types for constants
Data types for constants
Constants can hold various scalar data types like integers, floats, and strings.
Why use uppercase for constants
Why use uppercase for constants
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Defining a PHP constant
Defining a PHP constant
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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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