Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsTo add a button that follows the browser’s Back action, have PHP render a button that calls JavaScript’s history.back(). If a PHP form handler already knows where the user should go next, use a server-side redirect instead. PHP can generate the page or send a redirect response, but it cannot directly change the browser’s history.
Add a browser Back button to a PHP page
Put this HTML in the page your PHP script outputs:
<button type="button" onclick="history.back()">Back</button>The button runs in the visitor’s browser, where the History API can move back one session-history entry. MDN documents that history.back() has the same effect as history.go(-1). It does nothing if there is no previous entry, and navigation completes asynchronously.
PHP executes on the server; JavaScript executes in the browser. PHP may output HTML and JavaScript, but it does not have direct access to the browser’s session-history stack. The PHP manual describes PHP as server-side scripting that generates responses sent to the browser.
Choose between browser history and a redirect
These options do different jobs. A Back button asks the browser to revisit the prior history entry. A redirect sends the browser to a destination chosen by your application. Use a redirect when a handler has processed a request and knows the right next page; use browser history when the user should return to wherever they came from.
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#1 Best Overall
| Approach | Who chooses the destination? | If there is no prior history entry | Request behavior |
|---|---|---|---|
history.back() |
The browser’s session history | It does nothing | Traverses an existing history entry |
PHP Location redirect |
Your server-side code | Not applicable; it names a destination | Sends an HTTP response that directs the browser to a URL |
A history action may lead back to an external site or to an earlier page in a new tab’s available history. A redirect instead targets the URL your handler specifies, regardless of the page from which the user arrived.
Redirect after processing a PHP form
For a successful form submission, choose a known destination and send a redirect before producing any output:
Rank #2
<?php
// Validate and choose a local destination; do not copy an arbitrary URL.
header('Location: /account.php', true, 303);
exit;In this example, the application sends a 303 See Other response so the browser makes a follow-up request to /account.php. PHP’s header() documentation says headers must be sent before output; a Location: header otherwise defaults to status 302 unless a different status has already been set. Stop execution with exit after issuing the redirect so the handler does not continue running.
Why not redirect straight to HTTP_REFERER?
$_SERVER['HTTP_REFERER'] contains the HTTP Referer request header when the browser sends one. It may be absent or truncated, and referrer policies control what is sent; it is not a reliable way to determine a safe return destination. See RFC 9110’s Referer definition and MDN’s Referer documentation.
Do not use an unchecked Referer value as a redirect target. It could send a user somewhere your application did not intend. Prefer a fixed local fallback such as /dashboard.php, or accept only paths from an explicit allowlist. If the application needs to preserve a return destination, store a validated local path in the server-side session or use a signed state value.
Quick Recap
Rank #4
Which approach should you use?
- Return to the browser’s previous page: render a button that calls
history.back(), and account for the possibility that it has nowhere to go. - Send the user to a known page after a PHP action: issue a validated
Locationredirect with an appropriate status, before output, then callexit. - Return to a requested page safely: validate the destination against an allowlist or use a validated local path; do not trust a raw Referer header.
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