system/Debug/Exceptions.php
public static function describeMemory(int $bytes): string
	{
		if ($bytes < 1024)
		{
			return $bytes . 'B';
		}
		else if ($bytes < 1048576)
		{
			return round($bytes / 1024, 2) . 'KB';
		}

		return round($bytes / 1048576, 2) . 'MB';
	}
public static function describeMemory(int $bytes): string
	{
		if ($bytes < 1024)
		{
			return $bytes . 'B';
		}
		else if ($bytes < 1048576)
		{
			return round($bytes / 1024, 2) . 'KB';
		}

		return round($bytes / 1048576, 2) . 'MB';
	}
Describes memory usage in real-world units. Intended for use
with memory_get_usage, etc.

@param $bytes

@return string