field checking Follow

Hello,
I have a question regarding "field checking".
Lets have the following code:

1. $sql = "SELECT a FROM my_table WHERE id=12";
2. $result = $myagTools->mysql_query_routine($sql, $mydb_connection);
3. $count_rows = mysql_num_rows($result);
4. $row = mysql_fetch_object($result);
5. $value_a = $row->a;


When I do an inspection of that code with phpStorm, it tells me that there is a field error in line 5, because the inspector does not now, if the field "a" in row 5 is in the table.
As you see in row 2, I use a "special" function to do the sql_query, becuase I use that often in my projects and this routine "mysql_query_routine" is doing all my errorstuff and so on.

So is there a possibility to "tell" phpStorm-inspector, where the fields are defined. And how?

Thanks a lot?

Adrian.