=== 4zero4 ===
Contributors: DevFabio
Tags: 404, search, redirect, error page
Requires at least: 6.5
Tested up to: 7.0
Stable tag: 1.2
Requires PHP: 7.4
License: GPLv2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html

Turn "page not found" (404) errors into a helpful search instead of a dead end.

== Description ==

4zero4 makes your 404 pages useful. When a visitor reaches a URL that no longer
exists, the plugin builds a search query from the requested address and redirects
the visitor to your site's search results, so they land on relevant content
instead of an empty error page.

For example, a request for `/my-old-product-name/` that no longer resolves is
turned into a search for "my old product name".

Key points:

* **Zero configuration.** Activate it and it works.
* **Temporary redirect (302).** The original URL may become valid again, so the
  redirect is never cached as permanently moved.
* **Front-end only.** It never interferes with the admin area, feeds or the REST
  API, and only acts on normal GET page views.
* **No external services.** The plugin does not send any data anywhere and does
  not use tracking or analytics.

= Developer hooks =

The behaviour can be customised with filters:

* `p4zero4_search_terms` — change (or clear, to skip) the terms extracted from the URL.
* `p4zero4_redirect_url` — change (or clear, to cancel) the destination URL.
* `p4zero4_redirect_status` — change the HTTP status code (default `302`).

== Installation ==

1. Upload the `4zero4` folder to `/wp-content/plugins/`, or install the plugin
   from the Plugins screen in WordPress.
2. Activate the plugin through the "Plugins" menu in WordPress.
3. That's it — there are no settings. Any 404 will now redirect to a matching
   site search.

== Frequently Asked Questions ==

= Does the plugin have a settings page? =

No. It works out of the box with no configuration.

= Why am I redirected with a 302 and not a 301? =

A 404 is, by definition, temporary: the page might be restored later. A permanent
301 redirect would be cached by browsers and search engines and would be hard to
undo. You can change the status code with the `p4zero4_redirect_status` filter.

= Can I customise the search terms or the destination? =

Yes. Use the `p4zero4_search_terms`, `p4zero4_redirect_url` and
`p4zero4_redirect_status` filters described in the Description.

= Does the plugin send any data to external services? =

No. It performs a local redirect on your own site and contacts no third party.

== Changelog ==

= 1.2 =
* Security: the requested URL is now read, unslashed and sanitised safely instead
  of using a raw server variable.
* Redirects now use `wp_safe_redirect()` with a temporary 302 status instead of a
  raw permanent 301 header.
* Switched to the `template_redirect` hook and added guards for admin, feeds, REST
  and non-GET requests.
* Added a guard against direct file access (ABSPATH check).
* Added the `p4zero4_search_terms`, `p4zero4_redirect_url` and
  `p4zero4_redirect_status` filters.
* Completed the plugin header (License, Text Domain, Requires at least, Requires PHP).
* Rewrote the readme in English with full sections; fixed the Stable tag to match
  the plugin version.

= 1.1 =
* Previous public release.

== Upgrade Notice ==

= 1.2 =
Recommended security and reliability update: safe input handling, temporary (302)
redirects via wp_safe_redirect(), and new developer filters.