checkout.php

<?php
session_start();
include "koneksi.php";
$cart=@$_SESSION['cart'];
if(count($cart)>0){
$lama_pinjam=5; //satuan hari

$tgl_harus_kembali=date('Y-m-d',mktime(0,0,0,date('m'),(date('d')+$lama_pinjam),date('Y')));

mysqli_query($conn,"insert into peminjaman_buku
(id_siswa,tanggal_pinjam,tanggal_kembali)

value('".$_SESSION['id_siswa']."','".date('Y-m-d')."','".$tgl_harus_kembali."')");

$id=mysqli_insert_id($conn);
foreach ($cart as $key_produk => $val_produk) {
mysqli_query($conn,"insert into detail_peminjaman_buku(id_peminjaman_buku,id_buku,qty) value('".$id."','".$val_produk['id_buku']."','".$val_produk['qty']."')");
}
unset($_SESSION['cart']);
echo '<script>alert("Anda berhasil meminjam buku");location.href="histori_peminjaman.php"</script>';
}
?>