(PHP 8 >= 8.1.0)
UnitEnum::cases — Generates a list of cases on an enum
This method will return a packed array of all cases in an enumeration, in order of declaration.
У цієї функції немає параметрів.
An array of all defined cases of this enumeration, in order of declaration.
Приклад #1 Basic usage
The following example illustrates how enum cases are returned.
<?php
enum Suit
{
case Hearts;
case Diamonds;
case Clubs;
case Spades;
}
var_dump(Suit::cases());
?>Поданий вище приклад виведе:
array(4) {
[0]=>
enum(Suit::Hearts)
[1]=>
enum(Suit::Diamonds)
[2]=>
enum(Suit::Clubs)
[3]=>
enum(Suit::Spades)
}
If anyone is here wondering how to get all the names from the enum cases and map them into an array, it can be done like this:
array_column(CampaignPeriods::cases(), 'name');
Likewise, have the 2nd argument as 'value' to get the enum's values.
Happy coding, web artisan :)The Enum documentation says, "if a Backed Enum is serialized to JSON, it will be represented by its scalar value only, in the appropriate type."
This means you can easily get a backed Enum's values for use in a JSON document using only the BackedEnum::cases() method:
<?php
enum Suits: string {
case Hearts = 'Heart';
case Diamonds = 'Diamond';
case Clubs = 'Spade';
case Spades = 'Club';
}
echo json_encode(Suits::cases());
?>
Results in this output:
["Heart","Diamond","Spade","Club"]