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<?php
/**
* Interface QueryVar.
*
* @package AmpProject\AmpWP
*/
namespace AmpProject\AmpWP;
/**
* An interface to capture URL query vars used in the plugin.
*
* @package AmpProject\AmpWP
* @since 2.0
* @internal
*/
interface QueryVar {
/**
* Query var used to signal the request for an AMP page.
*
* Historically this value may be filtered via `amp_query_var` or overridden via the `AMP_QUERY_VAR` constant. The
* value then was also used as an endpoint (`/amp/`) in addition to being used as a URL query var (`?amp`).
* Nevertheless, in 2.0 this will no longer be supported in the theme itself when a Reader theme is selected.
* Additionally, the logic for determining whether a request is for an AMP endpoint or not may also be arbitrarily
* overridden as of amp-wp#2204.
*
* @link https://github.com/ampproject/amp-wp/issues/2204
* @see amp_get_slug()
* @var string
*/
const AMP = 'amp';
/**
* Query var used to signal the request for an non-AMP page.
*
* This is used in a paired mode (Transitional or Reader) in two ways:
*
* - To indicate that a mobile visitor should not be redirected to the AMP version. This is used in links from the
* AMP version back to the non-AMP version to prevent redirection. The value for the query var in this case is
* the NOAMP_MOBILE constant below.
* - To indicate that the AMP version should not even be made available when making a request. This is used when a
* user had tried to access the AMP version but there were validation errors which have kept invalid markup,
* causing the AMP version to not be available. In such case, non-authenticated users who cannot validate are then
* redirected to the non-AMP version with this query var added, along the below NOAMP_AVAILABLE constant as the value.
*
* This has no effect on an AMP-first site (Standard mode).
*
* @var string
*/
const NOAMP = 'noamp';
/**
* Value for the noamp query var to indicate that a mobile visitor should not be redirected to the AMP version of a page.
*
* @var string
*/
const NOAMP_MOBILE = 'mobile';
/**
* Value for the noamp query var to indicate that AMP should be disabled entirely for a given request.
*
* @var string
*/
const NOAMP_AVAILABLE = 'available';
/**
* Value for the query var that allows switching to verbose server-timing output.
*
* @var string
*/
const VERBOSE_SERVER_TIMING = 'amp_verbose_server_timing';
/**
* Query parameter provided to customize.php to indicate that the preview should be loaded with an AMP URL.
*
* @var string
*/
const AMP_PREVIEW = 'amp_preview';
/**
* Query parameter provided to Settings Screen to indicate that a scan should be automatically initiated if the results are stale.
*
* @var string
*/
const AMP_SCAN_IF_STALE = 'amp-scan-if-stale';
}