Veritabanı Bağlantı Bilgilerini Korumak

<?php
class db {
    var $veritabaniadi;
    var $link;
    var $hatanumarasi;
    var $hata;
    function db() {
        $sunucu = "localhost";
        $veritabani = "php";
        $kullaniciadi = "root";
        $sifre = "";
        $this->veritabaniadi = $veritabani;
        $this->link = mysqli_connect($sunucu,$kullaniciadi,$sifre,$veritabani);
        $this->hatanumarasi = mysqli_errno($this->link);
        $this->hata = mysqli_error($this->link);
    }
    function veritabaniadi() {
        return $this->veritabaniadi;
    }
    function link(){
        return $this->link;
    }
    function hatanumarasi(){
        return $this->hatanumarasi;
    }
    function  hata() {
        return $this->hata;
    }
}
$db=new db();
$sorgu=mysqli_query($db->link(),"select * from php limit 1");
while($s=mysqli_fetch_array($sorgu)){
    echo $s["id"]."<br>";
    echo $db->hata."<br>";
    echo $db->hatanumarasi."<br>";
    echo $db->veritabaniadi;
}
?>
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

1
0
php
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX