function get_array_needed() {
    $servername = "localhost";
    $username = "algolhos_unisitc";
    $password = "Un1s1t_commerce";
    $dbname = "algolhos_unisitc";

    // Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);
    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }

    $sql = "SELECT codice_target FROM customer";
    $result = $conn->query($sql);
    $rtoclass = array();

    if ($result->num_rows > 0) {
        // output data of each row
        while($row = $result->fetch_assoc()) {
            echo "id: " . $row["id_customer"]. " - Codice target: " . $row["codice_target"]."<br>";
            $rtoclass[] = $row;
        }
    } else {
        echo "0 results";
    }

    $conn->close();
    return $rtoclass;
}
    $obj->set_arr_needed( get_array_needed() ); // change $obj with the instance name writeToFile() is using...
    public function writeToFile($ae, $sorted_fields, $elements)
    {
        $url = $this->getFileUrl($ae->filename, $ae->type);

        $file = @fopen( $url, 'w' );
        //add labels for export data ==== Nascosto da Dario
        //if($ae->add_header)
          //$this->filewrite($ae, $sorted_fields, $file);

        $i = 0;
        while ($element = $this->nextRow($elements))
        {
            if ($i == $this->rowsNumber - 1)
            {
                $this->lastElement = $element;
            }

            Configuration::updateGlobalValue("AdvancedExport_CURRENT", (string)$i);
            //progress bar
            $this->getDataFromObject($element, $file, $sorted_fields, $ae);
            $i++; //progress bar
        }

        //close file
        if($file)
            fclose($file);

        return $url;
    }