Database.php
class Database{
    public $isConn;
    protected $datab;

    // connect to db
    public function __construct(){
        $this->isConn = TRUE;
        try {
                    $db_user = 'root_portal';
                        $db_pass = 'Ebm69b#5';
            $this->datab = new PDO('mysql:dbname=db12354864-sd;host=localhost', $db_user, $db_pass);

            #$this->datab->setAttribute(PDO::ATRR_ERRMODE, PDO::ERRMODE_EXCEPTION);
           # $this->datab->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
        } catch (PDOException $e) {
            throw new Exception($e->getMessage());
        }

    }

    // get row
    public function getRow($query, $params){
        try {
            $stmt = $this->datab->prepare($query);
            $stmt->execute($params);
            return $stmt->fetch();
        } catch (PDOException $e) {
            throw new Exception($e->getMessage());
        }
    }
    // get rows
    public function getRows($query){
        try {
            $stmt = $this->datab->prepare($query);
            $stmt->execute();
            return $stmt->fetchAll();
        } catch (PDOException $e) {
            throw new Exception($e->getMessage());
        }
    }
    // insert row
    public function insertRow($query, $params = array()){
        try {
            $stmt = $this->datab->prepare($query);
            $stmt->execute($params);
            return TRUE;
        } catch (PDOException $e) {
            throw new Exception($e->getMessage());
        }
    }
    // update row
    public function updateRow($query, $params = array()){
        $this->insertRow($query, $params);
    }
    // delete row
    public function deleteRow($query, $params = array()){
        $this->insertRow($query, $params);
    }
         // disconnect from db
    public function Disconnect(){
        $this->datab = NULL;
        $this->isConn = FALSE;
    }

}

// Ausgabe
require_once 'database.php';

function die_r($value){
    echo '<pre>';
    print_r($value);
    echo '</pre>';
}

$db = new Database();

$getRow = $db->getRow("SELECT * FROM user WHERE id = ? AND username =?", array(91, 'demo'));
$getRows = $db->getRows("SELECT * FROM user");
#$insertRow = $db->insertRow("INSERT INTO users(username, password, email) VALUE(?, ?, ?)", ["Arthur", "102030", "arthur@localhost"]);
#$updateRow = $db->updateRow("UPDATE users SET username = ?, password = ? WHERE id = ?", ["ArthurMann", "a123456", "7"]);
#$deleteRow = $db->deleteRow("DELETE FROM users WHERE id = ?", [8]);

die_r($getRows);
$db->Disconnect();