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Q:

How do I declare constants within an enumeration in PHP?

Hey everyone,

I've been using PHP and I'm currently working with enumerations. I wanted to know how I can declare constants within an enumeration in PHP.

I've already defined my enumeration using the `enum` keyword, like this:

```php
enum Fruit {
APPLE,
BANANA,
ORANGE
}
```

Now, I want to add constants within this enumeration to use throughout my code. For example, I want to assign a specific value to each fruit. How can I achieve this?

Any help or guidance would be greatly appreciated! Thank you in advance.

All Replies

asa92

Hey there,

Sure, I can help you with that. To declare constants within an enumeration in PHP, you can make use of the `const` keyword inside the enumeration definition.

For example, let's say you have the `Fruit` enumeration and you want to assign values to each fruit. You can do it like this:

php
enum Fruit {
const APPLE = 'Red';
const BANANA = 'Yellow';
const ORANGE = 'Orange';
}


Here, I've added the constants `APPLE`, `BANANA`, and `ORANGE` within the `Fruit` enumeration. Each constant is assigned a corresponding value using the equals sign.

Now you can access the constants throughout your code using the enumeration name followed by the double colon (`::`) and the constant name. For example:

php
echo Fruit::APPLE; // Output: Red


I hope this helps! Let me know if you have any further questions.

yost.cory

Hey there,

Absolutely! When it comes to declaring constants within an enumeration in PHP, there's a simple approach you can follow. Here's the technique that has worked well for me:

After defining your enumeration using the `enum` keyword, you can declare constants using the `define()` function. This lets you assign specific values to each constant within the enumeration.

Let's take the `Fruit` enumeration as an example:

php
enum Fruit {
APPLE,
BANANA,
ORANGE
}

define(Fruit::APPLE, 'Red');
define(Fruit::BANANA, 'Yellow');
define(Fruit::ORANGE, 'Orange');


In this code snippet, I've used the `define()` function to assign the values 'Red', 'Yellow', and 'Orange' to the constants `APPLE`, `BANANA`, and `ORANGE`, respectively, within the `Fruit` enumeration.

To access these constants in your code, you can use the enumeration name followed by the double colon (`::`) and the constant name, just like so:

php
echo Fruit::APPLE; // Output: Red


This method provides flexibility by allowing you to define the constants separately from the enumeration definition, in case you need to reuse them in different contexts.

If you have any further questions or need additional clarification, feel free to ask. Good luck with your PHP development!

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