Detect whether the page was refreshed

[NotionCommotion]

How can I detect if the page was refreshed?  I thought the following worked, however, after much head scratching, discovered it does not work for a POST request using the Chrome browser.  Thanks

<?php
$refresh=isset($_SERVER['HTTP_CACHE_CONTROL']) && $_SERVER['HTTP_CACHE_CONTROL'] === 'max-age=0';
echo(($refresh?'refresh':'not refresh').'<br>');
echo('$_GET<pre>'.print_r($_GET,1).'</pre>');
echo('$_POST<pre>'.print_r($_POST,1).'</pre>');
?>
<ul>
<li><a href="refresh.php?id=1">one</a></li>
<li><a href="refresh.php?id=2">two</a></li>
<li><a href="refresh.php?id=3">three</a></li>
</ul>
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<input type="text" name="text" value="hello">
<input type="submit" name="submit" value="submit">
</form>

[WinstonLA]

I don't quite understand... Do you trying do F5 protection?

[NotionCommotion]

I don't quite understand... Do you trying do F5 protection?

 

I have a class that uses sessions to remember the browsers immediate previous state.

 

I use it to validate when JS is not available (no, I do not validate using JS, but POST the data using Ajax and if no errors, redirect client side to the next page).  Upon a non-ajax post request, I validate data, and if an error, store the error and redirect the page back to the form page.

 

Going to another page will clear the history as desired, but I don't wish to clear it if it is just refreshed with F5 or equal.

[NotionCommotion]

This seems to work

if(($_SERVER['REQUEST_METHOD']==='POST') || !isset($_SERVER['HTTP_CACHE_CONTROL']) || $_SERVER['HTTP_CACHE_CONTROL'] !== 'max-age=0'){
  //store
}

[hansford]

When you load the page check for some cookie value. If it's not there, set some cookie value;

If the page gets refreshed it will check for that cookie value again. If it is there, you know the page has been revisited/refreshed. You will have to delete the cookie once it is no longer needed. It will be reset every time they visit that page. 

[NotionCommotion]

When you load the page check for some cookie value. If it's not there, set some cookie value;

If the page gets refreshed it will check for that cookie value again. If it is there, you know the page has been revisited/refreshed. You will have to delete the cookie once it is no longer needed. It will be reset every time they visit that page. 

 

Set it to what?  A serialized GET or something?  I am not concerned whether they have ever been there, only that it was the last page.

[hansford]

 

 

I am not concerned whether they have ever been there, only that it was the last page.

Well, you have sessions. You can store the last page name/url in a session variable. Whatever page they visit, this session variable gets updated. Then you will always know what the last page visited was.