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<?php include("config.php");?> <html> <head> <meta charset="UTF-8"> <title>借書功能頁</title> </head> <body> <?php // 如果圖書編號(hào)沒填寫，提示用戶 $book_id = $_GET['book_id']; if ($book_id==""){ //echo "<script language=javascript>alert('編號(hào)不正確');window.location='index.php'</script>"; exit(); } else { ?> <?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，記錄之 // 獲得當(dāng)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>"; ?> <?php } } ?> </body> </html>