Displaying a notification on page after redirect

I have a page with a form on it.

If the forms is submitted I redirect to that page again.

On the page I want to display a notification that the data is saved.

I'm looking for a clean way to know that I have to display the notification.

First I thought of adding something to the url:

/page?notify=1
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But I don't like to change the URL.

Then I thought of setting a session before the redirect.

And on the page I check if the session is set, display the notification if it is and unset it.

Would that be an acceptable way of doing it or is there perhaps a better / cleaner way?

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I personally think the ?notify= is perfectly acceptable. You're not going to have spiders crawling that page and since it's only a confirmation notification you don't need to worry about the page being indexed. Don't be afraid of query strings when you're out of the SEO realm - just look at Amazon.com :)

Ultimately it comes down to code re-usability and effort of implementation.

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A session is fine. A cookie that you delete immediately after would be even cleaner. Since a session id is usually a larger cookie than this anyways, and takes storage on your server.

setcookie('notify',1,time()+60); // Expire in one minute. Redirect should be faster.

Then on your page they are being redirected to:

if(isset($_COOKIE['notify']) && $_COOKIE['notify'] == 1){
    // Notification output
    setcookie('notify', '', time()-1);
}

Another Option you have is to is redirect the user to /page/notify and use your .htaccess with Rewrite Mod to rewrite that as /page?notify.

Something like:

RewriteRule ^(.*)/notify/?$ $1?notify=1

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Since you have a form, maybe you also have a submit button. You can check if the form is submitted like this:

<?php
    if(isset($_POST['go'])) {
        // The form has been submitted.
        echo("Saved!");
    }
?>
<form method = 'post' action = ''>
    <input type = 'submit' id = 'go' name = 'go' value = 'Submit'/>
</form>

EDIT

Since that won't work.. I generally keep a session variable as an array (I call it 'errors', but I use it for just general output). It's an array because it can hold multiple messages, and then on every single page display I dump whatever is in that array whererever I want to display those messages. This has worked for me across multiple projects, and seems to me to be a pretty good way of storing messages to be sent to the user

session_start();
$_SESSION['errors'] = array();

...

array_push($_SESSION['errors'], "<span style = 'color:green;'>Success!</span>");
header("Location: somepage.php");

And then display...

if(isset($_SESSION['errors']) && count($_SESSION['errors']) > 0) {
    foreach($_SESSION['errors'] as $k => $v)
        echo($v . "<br/>");
    unset($_SESSION['errors']);
}

---

first_page.php

$_SESSION['notify'] = 9;

second_page.php

if($_SESSION['notify'] > 0){
     notify(9);
     $_SESSION['notify'] = 0;
}

---

You can add a hidden field in your form like this:

<input type="hidden" name="action" value="submit" />

Then when the page is reloaded you can do this:

if($_POST['action'] == "submit"){
  // show that data was saved
}

I mean ideally you'll want to make sure the data was actually saved but Im not getting much into your implementation.