(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.
Questa funzione non contiene parametri.
An array of all defined cases of this enumeration, in order of declaration.
Example #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());
?>Il precedente esempio visualizzerà:
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"]