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<?php /** * Class ExtraThemeAndPluginHeaders. * * @package AmpProject\AmpWP */ namespace AmpProject\AmpWP; use AmpProject\AmpWP\Infrastructure\Registerable; use AmpProject\AmpWP\Infrastructure\Service; /** * Registers the 'AMP' extra header for themes and plugins. * * @package AmpProject\AmpWP * @since 2.0 * @internal */ final class ExtraThemeAndPluginHeaders implements Service, Registerable { /** * Header name. * * @var string */ const AMP_HEADER = 'AMP'; /** * AMP header value indicating legacy template support. * * @var string */ const AMP_HEADER_LEGACY = 'legacy'; /** * Register the service with the system. * * @return void */ public function register() { // Filter must be added as soon as possible since once wp_get_themes() is called, the results are cached. add_filter( 'extra_theme_headers', [ $this, 'filter_extra_headers' ] ); } /** * Add 'AMP' to the list of headers parsed from a theme's style.css or plugin's bootstrap file. * * For prior precedent here, WooCommerce adds a 'Woo' header. * * @see wc_enable_wc_plugin_headers() * @see \WC_Helper::get_local_woo_themes() * * @param string[] $headers Headers. * @return string[] Amended headers. */ public function filter_extra_headers( $headers ) { $headers[] = self::AMP_HEADER; return $headers; } }