PHP mysqli get_result doesn't work but bind_result works

Question

I have created a function which returns me all the rows returned by executing a given query. It works perfectly fine for all the Non Join Queries, but as soon as I call this function for a "SELECT * FROM A,B ..." kind of Join Queries, it gives me the error:

exception 'ErrorException' with message mysqli_stmt::bind_result(): Number of bind variables doesn't match number of fields in prepared statement'

So I looked around on stackoverflow, and started using get_result(..) instead of bind_result(..).

My previous code which used bind_result(...) is as follows :

function fetchRows($mysqli, $qry, $bindStr, $bindVarArr) {
if ($stmt = $mysqli->prepare($qry)) {

    $rows = NULL;

    if($bindVarArr != NULL && sizeof($bindVarArr) > 0) {

        array_unshift($bindVarArr, $bindStr);
        // $commaList = implode(', ', $bindVarArr);
        // $stmt->bind_param($bindStr, $commaList);
        call_user_func_array(array($stmt,'bind_param'), makeValuesReferenced($bindVarArr));
    }
    // Execute the prepared query.
    if (! $stmt->execute()) {
        throw new DBException(DBException::STMT_ERR_MSG, DBException::STMT_ERR_CODE, $qry);
    }

    $stmt->execute();
    $stmt->store_result();
    $num_rows = $stmt->num_rows;

    if ($num_rows <= 0) {
        // No rows returned, may be a valid case

    } else {

        // bind results to named array
        $meta = $stmt->result_metadata();
        $fields = $meta->fetch_fields();
        foreach($fields as $field) {
            $result[$field->name] = "";
            $resultArray[$field->name] = &$result[$field->name];
        }

        call_user_func_array(array($stmt, 'bind_result'), $resultArray);

        // create object of results and array of objects
        while($stmt->fetch()) {
                        /*
                         * If no result object is specified then create a new stdclass object
                         */
                        $resultObject = new stdClass();

                        foreach ($resultArray as $key => $value) {
                                $resultObject->$key = $value;
                        }
                        $rows[] = $resultObject;
        }
    }

    $stmt->close();

    return $rows;
} else {
    throw new DBException(DBException::STMT_ERR_MSG, DBException::STMT_ERR_CODE, $qry);
}

}

My new code which used get_result(...) is as follows :

function fetchRows($mysqli, $qry, $bindStr, $bindVarArr) {
if ($stmt = $mysqli->prepare($qry)) {

    $rows = NULL;

    if($bindVarArr != NULL && sizeof($bindVarArr) > 0) {

        array_unshift($bindVarArr, $bindStr);
        // $commaList = implode(', ', $bindVarArr);
        // $stmt->bind_param($bindStr, $commaList);
        call_user_func_array(array($stmt,'bind_param'), makeValuesReferenced($bindVarArr));
    }
    // Execute the prepared query.
    if (! $stmt->execute()) {
        throw new DBException(DBException::STMT_ERR_MSG, DBException::STMT_ERR_CODE, $qry);
    }

    $stmt->execute();
    $stmt->store_result();
    $num_rows = $stmt->num_rows;

    if ($num_rows <= 0) {
        // No rows returned, may be a valid case

    } else {

        $result = $stmt->get_result();
        while ($resultArray = $result->fetch_assoc()) {
                        /*
                         * If no result object is specified then create a new stdclass object
                         */
                        $resultObject = new stdClass();

                        foreach ($resultArray as $key => $value) {
                                $resultObject->$key = $value;
                        }
                        $rows[] = $resultObject;
        }
    }

    $stmt->close();

    return $rows;
} else {
    throw new DBException(DBException::STMT_ERR_MSG, DBException::STMT_ERR_CODE, $qry);
}

}

But now, it gives me an error as follows (On all possible queries, which were working with previous code):

PHP Fatal error: Call to a member function fetch_assoc() on boolean

It clearly suggests that the statement's get_result may have failed, but what could be the problem? The same query works perfectly fine otherwise with previous code which uses bind_result.

I'm using PHP 5.5 if that helps