I have written this function. It surprisingly works. (I didn´t really know what i was doing, just a little experiment.) It is supposed to count rows selected by PDO query. Is it well written? It works, but i am just asking, as it is my first more complex function.

function countRows($sql, $parameters){
            require("include/db.php");

            $result = $db->prepare($sql); 
            foreach ($parameters as $key => $parameter) {
                    $result->bindParam($key, $parameter);
            }

            $result->execute(); 
            $number_of_rows = $result->fetchColumn();

            return $number_of_rows;

            }

I have written this function that surprisingly works. (I didn't really know what I was doing; just a little experiment.) It is supposed to count rows selected by a PDO query. 

Is it well written? It works, but I am just asking, as it is my first more-complex function.

function countRows($sql, $parameters){
            require("include/db.php");

            $result = $db->prepare($sql); 
            foreach ($parameters as $key => $parameter) {
                    $result->bindParam($key, $parameter);
            }

            $result->execute(); 
            $number_of_rows = $result->fetchColumn();

            return $number_of_rows;

            }