Sql Katman Mysqli Veritabanı Sınıfı

<?php
class SQLKatman {
    var $sunucu;
    var $kullaniciadi;
    var $sifre;
    var $veritabaniadi;
    var $link;
    function SQLKatman ($sunucu = "", $kullaniciadi = "", $pass = "", $veritabaniadi = "") {
        $this->sunucu = $sunucu;
        $this->kullaniciadi = $kullaniciadi;
        $this->sifre = $pass;
        $this->veritabaniadi = $veritabaniadi;
        $this->baglan();
    }
    function baglan(){
        $this->link=mysqli_connect($this->sunucu,$this->kullaniciadi,$this->sifre,$this->veritabaniadi);
        mysqli_set_charset($this->link, "utf8");
    }
    function close(){
        return mysqli_close($this->link);   
    }
    function sorgu($sorgu){
        $this->rs=mysqli_query($this->link,$sorgu);
        if (!$this->rs){
            echo("Hata: Hatalı sorgu \"".$sorgu."\"...<br>");
            echo("Hata: ".mysqli_errno($this->link)."<br>");
            die("Hata: ".mysqli_error($this->link)."<br>");
        }else{
            return $this->rs;
        }
    }
    function veri_ara ($row = 0) {
        return mysqli_data_seek($this->rs,$row);
    }
    function dizi_getir($rs=""){
        if($rs==""){$rs=$this->rs;}
        $this->row=mysqli_fetch_array($rs);
    return $this->row;
    }
    function birles_getir($rs=""){
        if($rs==""){$rs=$this->rs;}
        $this->row=mysqli_fetch_assoc($rs);
    return $this->row;
    }
    function nesne_getir($rs=""){
        if($rs==""){$rs=$this->rs;}
        $this->row=mysqli_fetch_object($rs);
    return $this->row;
    }
    function satir_say($rs=""){
        if($rs == ""){$rs=$this->rs;}
        $rs = $this->rs;
    return mysqli_num_rows($rs);
    }
    function etkilenen_satir() {
        return mysqli_affected_rows($this->link);
    }
    function serbest_sonuc($rs = "") {
        if($rs == ""){$rs=$this->rs;}
        $rs = $this->rs;
    return mysqli_free_result($rs);
    }
}
$s=new SQLKatman("localhost","root","","php");
$s->sorgu("select * from php where id=1");
print_r($s->dizi_getir());echo "<br>";
$s->sorgu("select * from php where id=1");
print_r($s->birles_getir());echo "<br>";
$s->sorgu("select * from php where id=1");
print_r($s->nesne_getir());echo "<br>";
$s->sorgu("select * from php where id=1");
print_r($s->satir_say());echo "<br>";
$s->sorgu("select * from php where id=1");
print_r($s->etkilenen_satir());echo "<br>";
$s->sorgu("select * from php where id=1");
print_r($s->serbest_sonuc());
$s->sorgu("select * from php where id=1");
var_dump($s->veri_ara(2));
?>
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Array ( [0] => 1 [id] => 1 ) 
Array ( [id] => 1 ) 
stdClass Object ( [id] => 1 ) 
1
1
bool(false)
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