How to Get an Array of All Backed Enum Cases in PHP?

You can get all cases defined in a PHP backed enum as an array by calling the static cases() method on the enum:

// PHP 8.1+
MyEnum::cases();

The return value of the static cases() method is an array of all defined enum cases in the order of their declaration. For example:

// PHP 8.1+
enum MyEnum: string
{
    case Foo = 'foo';
    case Bar = 'bar';
    case Baz = 'baz';
}

$cases = MyEnum::cases();

var_dump($cases); // [enum(MyEnum::Foo), enum(MyEnum::Bar), enum(MyEnum::Baz)]

echo $cases[0]->name; // 'Foo'
echo $cases[0]->value; // 'foo'

The static cases() method is available on both, pure enums and backed enums, as they both implement the common, internal interface named UnitEnum (which includes the static method cases()).