Best practices: `array_find_key` on `Enum::cases`?

From:	0xEAB	Date:	Wed, 29 Apr 2026 21:54:38 +0000
Subject:	Best practices: `array_find_key` on `Enum::cases`?
References:	1	Groups:	php.general
Request:	Send a blank email to php-general+get-328815@lists.php.net to get a copy of this message

I’ve written an enum method as follows.

public function getPrefixBitCount(): int
{
	return array_find_key(self::cases(), function(CidrMaskIPv4 $value): bool {
		return $value === $this;
	});
}

Is this usage of Enum::cases() fine? Can the order of cases in the returned array be relied on? Can the numeric keys of the returned array be relied on?