Submit Multipel Data dengan PHP

// cara input multipel data ke database

/** insert multipel data **/
// file multipel-insert-kategori.php
<?php
include "koneksi.php";

echo "<form action=\"tambah.php\" method=\"post\"><table>
<tr>
    <th>No.</th>
    <th>Nama Kategori</th>
    <th>Slug</th>
</tr>";
$jml_data = 10;
for($i=1;$i<=$jml_data;$i++){
echo "<tr>
    <td align=\"center\">$i.</td>
    <td><input type=\"text\" name=\"nama_kategori[]\" /></td>
    <td><input type=\"text\" name=\"slug[]\" /></td>
</tr>";
}
echo "</table><input type=\"submit\" name=\"simpan\" value=\"Simpan Perubahan\" /></form>";
?>


// file tambah.php
<?php
include "koneksi.php";
if(isset($_POST['simpan'])){
// loop data
foreach($_POST['nama_kategori'] as $index=>$nama_kategori){
    $slug = $_POST['slug'][$index];
    if(trim($nama_kategori)!="" && trim($slug)!="") // validasi inputan tidak kosong
        echo("INSERT into kategori(nama_kategori,slug) VALUES('$nama_kategori','$slug')<br />");
}
echo "<script>history.back()</script>";
}
?>


/** update multipel data **/
// file tampildata.php
<?php
echo "<form action=\"simpan.php\" method=\"post\">
<table>
<tr>
    <th>No.</th>
    <th>Nama Kategori</th>
    <th>Slug</th>
    <th>Hapus</th>
</tr>";
$no = 1;
$sql = mysql_query("SELECT * from kategori order by nama_kategori");
while($data = mysql_fetch_array($sql)){
echo "<tr>
    <td align=\"center\">$no.<input type=\"hidden\" name=\"id[]\" value=\"$data[idkategori]\" /></td>
    <td><input type=\"text\" name=\"nama_kategori[]\" size=\"40\" value=\"$data[nama_kategori]\" /></td>
    <td><input type=\"text\" name=\"slug[]\" size=\"40\" value=\"$data[slug]\" /></td>
    <td align=\"center\"><input type=\"text\" name=\"hapus[]\" size=\"40\" value=\"1\" /></td>
</tr>";
}
echo "</table><p><input type=\"submit\" name=\"simpan\" value=\"Simpan Perubahan \" /></p></form>";
?>

// file simpan.php
<?php
include "koneksi.php";
if(isset($_POST['simpan'])){
// loop data
foreach($_POST['id'] as $index=>$idkategori){
    $nama_kategori= $_POST['nama_kategori'][$index];
    $slug = $_POST['slug'][$index];
    $hapus= $_POST['hapus'][$index];
    // update
      mysql_query("UPDATE kategori set nama_kategori='$nama_kategori', slug='$slug' where idkategori='$idkategori'");
    // hapus data
    if($hapus)
        mysql_query("DELETE from kategori where idkategori='$idkategori'");
}
echo "<script>history.back()</script>";
}
?>