Using Enums for Bitfield Values in PHP8.1 (and convert int values to string arrays or original enum value arrays)

Enum_Bitfield.php

<?php

enum Status : int
{
	case Undefined =       0;
	case Opt1      = 1 <<  0;
	case Opt2      = 1 << 62;
	case Opt3      = 1 << 63;

	static public function MatchArr(int $x) : false|array
	{
		if ($x === 0) { return [Status::Undefined]; }
		$ret = [];
		for ($i = 0; $i <= 63; $i++) {
			if ($x & (1 << $i)) {
				$ret[] = Status::from($x & (1 << $i));
			}
		}
		if (empty($ret)) { return false; }
		return $ret;
	}

	static public function ToStrings(int $x) : false|array
	{
		if ($x === 0) { return ['Undefined']; }
		$ret = [];
		if ($x & self::Opt1->value) { $ret[] = 'Opt1'; }
		if ($x & self::Opt2->value) { $ret[] = 'Opt2'; }
		if ($x & self::Opt3->value) { $ret[] = 'Opt3'; }
		if (empty($ret)) { return false; }
		return $ret;
	}
}


//////////////////////////////////////////////////////
// for ($i = 0; $i <= 64; $i++) {
// 	echo "Bit# ".($i+1)." : ".(1 << $i)."\n";
// }


//////////////////////////////////////////////////////
echo "\n";

$x1 = 1;
$x4 = 4;

$x = $x1 | $x4;
if ($x & 4) {
	echo "true\n";
} else {
	echo "false\n";
}
if ($x & 2) {
	echo "true\n";
} else {
	echo "false\n";
}


//////////////////////////////////////////////////////
echo "\n";
echo "$x\n";

$x = Status::Opt2->value;
if ($x & (1 << 62)) {
	echo "true\n";
} else {
	echo "false\n";
}

$x = Status::Opt3->value;
if ($x & (1 << 63)) {
	echo "true\n";
} else {
	echo "false\n";
}


//////////////////////////////////////////////////////
echo "\n";
$x = Status::Opt2->value;
echo "$x: ".str_pad(decbin($x),64,'0',STR_PAD_LEFT)."\n";
$x = Status::Opt3->value;
echo "$x: ".str_pad(decbin($x),64,'0',STR_PAD_LEFT)."\n";
$x = Status::Opt3->value | Status::Opt2->value;
echo "$x: ".str_pad(decbin($x),64,'0',STR_PAD_LEFT)."\n";

if ($x & Status::Opt3->value) {
	echo "true\n";
} else {
	echo "false\n";
}
if ($x & Status::Opt1->value) {
	echo "true\n";
} else {
	echo "false\n";
}


//////////////////////////////////////////////////////
echo "\n";

$x = Status::Opt3->value | Status::Opt2->value;
$matchArr = Status::MatchArr($x);
if ($matchArr) {
	foreach ($matchArr as $matchItem) {
		echo $matchItem->value."\n";
	}
} else {
	echo "false\n";
}

$matchArr = Status::ToStrings($x);
if ($matchArr) {
	foreach ($matchArr as $matchItem) {
		echo $matchItem."\n";
	}
} else {
	echo "false\n";
}