Redirect user on last page ( or page he came from ) PHP / JS

Question

in administration i have simple list of users ( 1 line = 1 user ). And as it used to be I have a button for "EDIT" and button for "DETAIL". And here it is how each line looks like:

When user click on detail or edit it redirect him on new address (something like detail/24 (where 24 is ID) or edit/24

Question is:
1# How can I redirect user from detail to page he came from ( because of paginator it is important to redirect on specific page like: list.php?page=4

2# How can I redirect user from edit if he press something like SAVE which basicly reload edit page so he is not able to store it anywhere.

In another words for #2, user is on page list.php?page=4 and click EDIT so he get to something like /edit/32 on that page he make some changes and press SAVE button. When he click this button PHP send FORM and refresh page.

Is there a way to redirect user on page list.php?page=4 without knowing if he press SAVE or not?

3# Is there some other way how to redirect on last page? which simulate "GO BACK" button in browser?

Answer 1

2# Location.reload()

location.reload();

1# and 3# Window.history

<button onclick="goBack()">Go Back</button>

<script>
     function goBack() {
         window.history.back();
     }
</script>

Answer 2

If you want to redirect before rendering the HTML, I sugest you use header with $_SERVER global variable.

if($condition === true)
header('Location: '.$_SERVER['HTTP_REFERER']);

$_SERVER['HTTP_REFERER'] ( http://php.net/manual/en/reserved.variables.server.php ) returns the url of the page the user comes from.

Please note header function will only works if there no output before the call.

Hope can help!