PHP Admin Paneli Giriş Sorunu (Ücretli Destek)

1. uyeler

1. id
2. username
3. password

<?php
$host="localhost";
$db="bank";
$user="";
$pass="";
$conn=@mysql_connect($host,$user,$pass) or die("Mysql Baglanamadi");

mysql_select_db($db,$conn) or die("Veritabanina Baglanilamadi");
mysql_set_charset('latin5',$conn);
?>

<form class="woocommerce-form woocommerce-form-login login" action="login.php" method="post">


<p class="woocommerce-form-row woocommerce-form-row--wide form-row form-row-wide">
<label for="username">Hesap Numarası veya TC Kimlik No&nbsp;<span class="required">*</span></label>
<input type="text" class="woocommerce-Input woocommerce-Input--text input-text" name="kadi" autocomplete="username"></p>
<p class="woocommerce-form-row woocommerce-form-row--wide form-row form-row-wide">
<label for="password">Parola&nbsp;<span class="required">*</span></label>
<input class="woocommerce-Input woocommerce-Input--text input-text" type="password" name="sifre" >
</p>

<p class="form-row">
<label class="woocommerce-form__label woocommerce-form__label-for-checkbox woocommerce-form-login__rememberme">
<input class="woocommerce-form__input woocommerce-form__input-checkbox" name="rememberme" type="checkbox" id="rememberme" value="forever"> <span>Beni hatırla</span>
</label>
<button type="submit" class="woocommerce-button button woocommerce-form-login__submit" name="login" value="Giriş Yap">Giriş Yap</button>
</p>

</form>

<?php

include("ayar.php");
ob_start();
session_start();

$kadi = $_POST['kadi'];
$sifre = $_POST['sifre'];

$sql_check = mysql_query("select * from uyeler where username='".$kadi."' and password='".$sifre."' ") or die(mysql_error());

if(mysql_num_rows($sql_check)) {
$_SESSION["login"] = "true";
$_SESSION["user"] = $kadi;
$_SESSION["pass"] = $sifre;
header("Location:musteri-paneli.php");
}
else {
if($kadi=="" or $sifre=="") {
echo "<center>Lutfen kullanici adi ya da sifreyi bos birakmayiniz..! <a href=javascript:history.back(-1)>Geri Don</a></center>";
}
else {
echo "<center>Kullanici Adi/Sifre Yanlis.<br><a href=javascript:history.back(-1)>Geri Don</a></center>";
}
}

ob_end_flush();
?>

Fatal Error : Uncaught Error: Call to undefined function mysql_connect() in C:xampphtdocsayar.php:6 Stack trace: #0 C:xampphtdocslogin.php(3): include() #1 {main} thrown in [B]C:xampphtdocsayar.php[/B] on line [B]6[/B]