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<?php
declare(strict_types=1);
namespace unreal4u\MQTT;
final class Utilities
{
/**
* Swaps the given number from endian format (INT16, not to be confused with UINT16)
*
* @param int $number
* @return int
* @throws \OutOfRangeException
*/
public static function convertEndianness(int $number): int
if ($number > 65535) {
throw new \OutOfRangeException('This is an INT16 conversion, so the maximum is 65535');
}
$finalNumber = hexdec(
// Invert first byte and make it a complete hexadecimal number
str_pad(dechex($number & 255), 2, '0', STR_PAD_LEFT) .
// Invert second byte and make a complete hexadecimal number
str_pad(dechex($number >> 8), 2, '0', STR_PAD_LEFT)
);
return (int)$finalNumber;
* Converts a number to a binary string that the MQTT protocol understands
* @return string
public static function convertNumberToBinaryString(int $number): string
return \chr($number >> 8) . \chr($number & 255);
* Converts a binary representation of a number to an actual int
* @param string $binaryString
public static function convertBinaryStringToNumber(string $binaryString): int
return self::convertEndianness((\ord($binaryString{1}) << 8) + (\ord($binaryString{0}) & 255));
unreal4u /
mqtt
