Mysql Pass & Salt IPboard

$result=$mysqli->query("SELECT * FROM ".$pf."core_members WHERE member_id='" . $id . "'");
while($rows=$result->fetch_array()){
	$checkpass=$rows['members_pass_hash'];
	$salt=$rows['members_pass_salt'];
	}

$password = md5( md5( $salt ) . md5( $password ) );

static public function authenticateMember( $member_key, $md5_once_password )
	{
		/* Load member */
		$member = self::load( $member_key );

		if ( ! $member['member_id'] )
		{
			return FALSE;
		}

		if ( $member['members_pass_hash'] == self::generateCompiledPasshash( $member['members_pass_salt'], $md5_once_password ) )
		{
			return true;
		}
		else
		{
			return false;
		}
	}



static public function generateCompiledPasshash( $salt, $md5_once_password )
	{
		return md5( md5( $salt ) . $md5_once_password );
	}


static public function generatePasswordSalt($len=5)
	{
		$salt = '';

		for ( $i = 0; $i < $len; $i++ )
		{
			$num   = mt_rand(33, 126);

			if ( $num == '92' )
			{
				$num = 93;
			}

			$salt .= chr( $num );
		}

		return $salt;
	}



	static public function generateAutoLoginKey( $len=60 )
	{
		$pass = self::generatePasswordSalt( $len );

		return md5($pass);
	}