cekadmin

<?php
include 'koneksi.php';
if(isset($_POST['submit']))
{
    $user = $_POST['username'];

    $cekuser = mysql_num_rows(mysql_query("select username_admin from admin where username_admin = '$user' "));

    if(empty($user))
    {
       header('location:home.php?page=tambah_admin&info=Username Harus di isi');
   }
    elseif($cekuser>0)
    {
        header('location:home.php?page=tambah_admin&info=Username sudah ada silahkan di ganti dengan yang lain');
    }
    else
    {
       header('location:aksitambahadmin.php');
    }
}
?>