我正在为大学做一个数据库项目，我在这里遇到了一个问题。
我从上一个页面收到一个id，名为$_POST['ids']，在表单中，我在一个隐藏字段中发送相同的值，这样它就可以进行某种循环。
但是当我点击提交按钮时，我在$service_info上得到了很多错误，并且页面上没有加载任何信息。我试着做var_dump（）所有的事情，但我找不到这里的问题所在。
<?php
//error_reporting();
require 'core/init.php';
require 'db/connect.php';
require 'functions/security.php';
?>
<html>
<head>
<title>Make a reservation</title>
<meta charset="UTF-8">
<link rel="stylesheet" href="css/common.css">
</head>
<body>
<?php require 'parts/header.php'; ?>
<hr>
<?php
$query = "SELECT * FROM service WHERE id=" . $_POST['ids'];
if ($result = $db->query($query)) {
if ($result->num_rows) {
$service_info = $result->fetch_object();
$result->close();
}
}
$query = "SELECT name FROM tour WHERE id =" . $service_info->idtour;
if ($result = $db->query($query)) {
if ($result->num_rows) {
$tour_name = $result->fetch_object();
$result->close();
}
}
$query = "SELECT SUM(nrseats) AS res_seats FROM reservation_service WHERE idservice =" . $service_info->id;
$nr_reservations_info = $db->query($query);
$nr_reservations = $nr_reservations_info->fetch_row();
$nr_reservations_info->close();
$count = $service_info->nrseats - $nr_reservations[0];
if($count === 0){
echo "<script>alert('There are no more places available for this tour. You are being redirected for the main page!')</script>";
echo "<script>window.open('index.php','_self')</script>";
}
else{
$count = $service_info->nrseats;
}
?>
<form action="" method="POST">
<div class="registering">
<table>
<tbody>
<tr>
<td>
<label for="tname">Related tour</label>
</td>
<td>
<label for="splace"><br>Service name</label>
</td><p><br></p>
</tr>
<tr>
<td>
<input type="text" readonly="" name="tour" id="tour" required="" autofocus="" value="<?php echo $tour_name->name ?>">
</td>
<td>
<input type="text" readonly="" name="name" id="name" required="" value="<?php echo $service_info->name ?>">
</td>
</tr>
<tr>
<td>
<label for="sprice"><br>Price (€)</label>
</td>
<td>
<label for="sdescription"><br>Description</label>
</td>
</tr>
<tr>
<td>
<input type="number" name="price" id="price" readonly="" required="" value="<?php echo $service_info->price ?>">
</td>
<td>
<input type="text" name="description" id="description" required="" readonly="" value="<?php echo $service_info->description ?>">
</td>
</tr>
<tr>
<td>
<label for="sseats"><br>Seats left</label>
</td>
<td>
<label for="snreservations"><br>Number of reservations (people)</label>
</td>
</tr>
</tr>
<tr>
<td>
<input type="number" name="nrseats" id="nrseats" required="" value="<?php echo $count ?>" readonly="">
</td>
<td>
<input type="number" name="nrreservations" id="nrreservations" required="" value="1">
</td>
<td>
<input type="hidden" name="ids" required="" value="<?php $service_info->id ?>">
</td>
</tr>
</tr>
<tr>
<td colspan="2">
<label for="next"><br></label>
<input type="submit" value="Next">
</td>
</tr>
</tbody>
</table>
</div>
</form>
</body>
</html>
<?php
if (!empty($_POST)) {
if (isset($_POST['name'], $_POST['ids'], $_POST['tour'], $_POST['price'], $_POST['description'], $_POST['nrseats'], $_POST['nrreservations'])) {
$_POST = array_map("trim", $_POST);
$name = $_POST['name'];
$tour = $_POST['tour'];
$price = $_POST['price'];
$description = $_POST['description'];
$nrseats = $_POST['nrseats'];
$nrreservations = $_POST['nrreservations'];
$ids = $_POST['ids'];
if (!empty($name) && !empty($ids) && !empty($tour) && !empty($price) && !empty($description) && !empty($nrseats) && !empty($nrreservations)) {
$query = "SELECT id FROM customer WHERE email='" . $_SESSION['user_email'] . "'";
if ($result = $db->query($query)) {
$id_user = $result->fetch_object();
$result->close();
}
$query = "SELECT id FROM reservation WHERE idtour={$service_info->idtour} AND idcustomer={$id_user->id}";
if ($result = $db->query($query)) {
if ($result->num_rows) {
$id_reservation = $result->fetch_object();
$result->close();
}
}
$query = "SELECT * FROM reservation_service WHERE idservice=" . $service_info->id;
if ($result = $db->query($query)) {
if ($result->num_rows) {
$reservation_service_exists = $result->fetch_object();
if ($nrreservations < 1) {
echo "<script>alert('Your must make a reservation for, at least, one person!')</script>";
echo "<script>window.open('new_reservation_service.php','_self')</script>";
} else if ($count - $nrreservations < 0) {
echo "<script>alert('You can not make the reservation because there are only " . $count . " seats available in this tour!')</script>";
echo "<script>window.open('new_reservation_service.php','_self')</script>";
} else if ($result->num_rows) {
$query = "SELECT * FROM reservation WHERE idcustomer= '" . $id_user->id . "' AND idtour= '" . $service_info->idtour . "'";
if ($result = $db->query($query)) {
if ($result->num_rows) {
$reservation_exists = $result->fetch_object();
$result->close();
if ($reservation_exists->idcustomer === $id_user->id) {
if ($reservation_exists->id === $reservation_service_exists->idreservation) {
echo "<script>alert('You already made a reservation for this service. Please see your reservation panel!')</script>";
echo "<script>window.open('reservations.php','_self')</script>";
}
}
}
}
}
}else {
$query = "INSERT INTO reservation_service (idreservation, idservice, date, nrseats) VALUES (?, ?, NOW(), ?)";
$insert = $db->prepare($query);
$insert->bind_param('iii', $id_reservation->id, $service_info->id, $nrreservations);
$insert->execute();
echo "<script>alert('You successfully made a reservation! You are being redirected to your reservations page')</script>";
echo "<script>window.open('reservations.php','_self')</script>";
}
}
}
}
}
?>
在表单中更改您创建的隐藏输入：
<input type="hidden" name="ids" required="" value="<?php $service_info->id ?>">
至
<input type="hidden" name="ids" required="" value="<?php echo $service_info->id ?>">
如果你不回显这个值，$_POST〔'ids‘〕将不会得到从表单传递的任何值。