在MySQL中将URL中的$ _GET变量与？id =一起使用

Question

I am trying to redirect a user to the previous page (topic.php) when they successfully submit a new post. That's easy:

header("Location: viewtopic.php?id=" . $topicid . ");

I may be going about this the wrong way, but on success, i want them to be redirected automatically to the address above and display a success message.

Some of my postreply.php

$result = $database->query($sql);

if ($result) {
    header('Location: /community/viewtopic.php?id=' . $topicid . '+status=success');
}else {
    echo "Query failed" . print_r($sql);
}

This is on the viewtopic.php:

$statusmsg = $_GET['status'];

  if (isset($statusmsg)) {
if ($statusmsg === "success") {
  $statusmsg = '<div class="alert alert-success" role="alert">
                  <strong>Success!</strong> Your post was submitted.
                </div>';
}else {
  $statusmsg = "";
}
  }

Understandably, php thinks the +status=success is part of the query to fetch the data from the database, thus results in a MySQL error.

Is there a way of doing this?

Answer 1

You should use & instead of + when passing parameters from the url to the $_GET super-global in PHP.

So, you need to change '+status=success' to '&status=success'

Also, as noted in the comment you should always validate user input sent via $_POST / $_GET .

in your case, you can use filter_var()

if(isset($_GET['success'])){
    $statusmsg = filter_var($_GET['success'], FILTER_VALIDATE_STRING);

    if($statusmsg) { 
      echo $statusmsg; 
    }else{
       // unsafe or invalid string passed 
    }
} 

Answer 2

Change here like this:

header('Location: /community/viewtopic.php?id=' . $topicid . '&status=success');

viewtopic.php

$statusmsg = $_GET['status'];
if (isset($statusmsg) && !empty($statusmsg)) {
    if ($statusmsg == "success") {
      $statusmsg = '<div class="alert alert-success" role="alert">
                      <strong>Success!</strong> Your post was submitted.
                    </div>';
    }else {
      $statusmsg = "";
    }
}

Answer 3

header('Location: /community/viewtopic.php?id=' . $topicid . '+status=success');

在此行中的“ +”位置使用“＆”。您将能够获取URL中传递的状态值。

Answer 4

Replace + with & like this :

header('Location: /community/viewtopic.php?id=' . $topicid . '&status=success');

Now the $_GET['status'] catch the status value