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<?php
$book_id = $_GET['book_id'];
if ($book_id==""){
echo "<script language=javascript>alert('編號不正確');window.location='index.php'</script>";
exit();
}
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<?php
// 借書
// 查看用戶ID是否已填
if ($_SESSION['id']==""){
echo "<script language=javascript>alert('您還沒有登陸');window.location='landing.php'</script>";
exit();
}else{
// 可以正常借書，記錄id
// 獲得當前日期
$now = date("Y-m-d,H-i-m");
$lendsql="INSERT INTO lend(book_id, book_title, lend_time, user_id) values('$book_id','$title','$now','".$_SESSION['id']."')";
mysqli_query($link,$lendsql);
// 借出后需要在該書記錄中庫存剩余數(shù)減一
mysqli_query($link,"update yx_books set leave_number=leave_number-1 where id='$book_id'");
echo "<script language=javascript>alert('借閱完成');window.location='index.php'</script>";
}
?>
