Hash::salt method issue

Quote:

I have Hash class as follows:

class Hash
	{
		public static function make($string, $salt='')
		{
			echo $string.$salt;
			return hash('sha256',$string.$salt);
		}

		public static function salt($length)
		{
			return mcrypt_create_iv($length);
		}

		public static function unique()
		{
			return self::make(uniqid());
		}
	}

I am colling method salt() with command:
$salt=Hash::salt(32)

Unfortunatelly, function mcrypt_create_iv is not working on newer php.

How to redesign Hasch class?

Thank you