Login PHP

<?php
if(isset($_POST["Login"])){
$usr=$_POST["user"];
$pas=$_POST["pass"];

$sql1="select * from `$tbadmin` where `username`='$usr' and `password`='$pas' and `status`='Aktif'";

if(getJum($conn,$sql1)>0){
$d=getField($conn,$sql1);
$kode=$d["kode_admin"];
$nama=$d["username"];
if($usr==$nama){
   $_SESSION["cid"]=$kode;
   $_SESSION["cnama"]=$nama;
   $_SESSION["cstatus"]="Administrator";
echo "<script>alert('Otentikasi ".$_SESSION["cstatus"]." ".$_SESSION["cnama"]." (".$_SESSION["cid"].") berhasil Login!');
document.location.href='index.php?mnu=home';</script>";
        }
else{
session_destroy();
echo "<script>alert('Otentikasi GAGAL Login!,Silakan cek data Anda kembali...');
document.location.href='index.php?mnu=login';</script>";
}
}

else{
session_destroy();
echo "<script>alert('Otentikasi Login GAGAL !,Silakan cek data Anda kembali...');
document.location.href='index.php?mnu=login';</script>";
}
}


?>