php error

function isi_keranjang(){
  $isikeranjang = array($con);
  $sid = $_SESSION[email];
  $sql1 ="SELECT * FROM orders_temp WHERE id_session='$sid'";
  $hasil1 = mysqli_query($con,$sql1);

  while ($r3=mysqli_fetch_array($hasil1)) {
    $isikeranjang[] = $r3;
  }
  return $isikeranjang;
}
date_default_timezone_set('Asia/Jakarta');
$tgl_skrg = date("Ymd");
$jam_skrg = date("H:i:s");

$id = mysqli_fetch_array(mysqli_query($con,"SELECT id_kustomer FROM kustomer WHERE email='$email' AND password='$password'"));

// mendapatkan nomor kustomer
$id_kustomer=$id[id_kustomer];

// simpan data pemesanan
mysqli_query($con,"INSERT INTO orders(tgl_order,jam_order,id_kustomer) VALUES('$tgl_skrg','$jam_skrg','$id_kustomer')");


// mendapatkan nomor orders
$id_orders=mysqli_insert_id($con);

// panggil fungsi isi_keranjang dan hitung jumlah produk yang dipesan
$isikeranjang = isi_keranjang();
$jml          = count($isikeranjang);

// simpan data detail pemesanan
for ($i = 0; $i < $jml; $i++){

mysqli_query($con,"INSERT INTO orders_detail(id_orders, id_produk, jumlah)
              VALUES('$id_orders','{$isikeranjang[$i]['id_produk']}', '{$isikeranjang[$i]['jumlah']}')");
}

// setelah data pemesanan tersimpan, hapus data pemesanan di tabel pemesanan sementara (orders_temp)
for ($i = 0; $i < $jml; $i++) {
mysqli_query($con,"DELETE FROM orders_temp
              WHERE id_orders_temp = {$isikeranjang[$i]['id_orders_temp']}");
}