← All changes | modules/canonical-urls.php +92 -0 16.2-beta → 16.3 View file →

		@@ -1,0 +1,92 @@
	1	+<?php
	2	+/**
	3	+ * Module Name: Canonical URLs
	4	+ * Module Description: Add canonical URL tags to archive pages to prevent duplicate content in search engines.
	5	+ * Sort Order: 36
	6	+ * First Introduced: 15.6
	7	+ * Requires Connection: No
	8	+ * Requires User Connection: No
	9	+ * Auto Activate: No
	10	+ * Module Tags: Traffic
	11	+ * Feature: Traffic
	12	+ * Additional Search Queries: canonical, seo, duplicate content, woocommerce, archive
	13	+ *
	14	+ * @package automattic/jetpack
	15	+ */
	16	+
	17	+if ( ! defined( 'ABSPATH' ) ) {
	18	+ exit( 0 );
	19	+}
	20	+
	21	+// Disable canonical URL output when a conflicting SEO plugin is active.
	22	+add_filter( 'jetpack_disable_canonical_urls', 'jetpack_canonical_urls_check_conflicts' );
	23	+
	24	+/**
	25	+ * Can be used to prevent the Canonical URLs module from outputting canonical tags.
	26	+ *
	27	+ * @module canonical-urls
	28	+ *
	29	+ * @since 15.6
	30	+ *
	31	+ * @param bool $disabled Whether canonical URL output is disabled. Defaults to false.
	32	+ */
	33	+if ( ! apply_filters( 'jetpack_disable_canonical_urls', false ) ) {
	34	+ require_once __DIR__ . '/canonical-urls/class-jetpack-canonical-urls-resolver.php';
	35	+ add_action( 'wp_head', 'jetpack_canonical_urls_output_tag' );
	36	+}
	37	+
	38	+/**
	39	+ * Check if a conflicting SEO plugin is active and disable canonical URL output.
	40	+ *
	41	+ * @since 15.6
	42	+ *
	43	+ * @param bool $disabled Whether canonical URL output is already disabled.
	44	+ * @return bool Whether canonical URL output should be disabled.
	45	+ */
	46	+function jetpack_canonical_urls_check_conflicts( $disabled ) {
	47	+ if ( $disabled ) {
	48	+ return $disabled;
	49	+ }
	50	+
	51	+ $conflicting_plugins = array(
	52	+ 'wordpress-seo/wp-seo.php',
	53	+ 'wordpress-seo-premium/wp-seo-premium.php',
	54	+ 'all-in-one-seo-pack/all_in_one_seo_pack.php',
	55	+ 'all-in-one-seo-pack-pro/all_in_one_seo_pack.php',
	56	+ 'seo-by-rank-math/rank-math.php',
	57	+ 'autodescription/autodescription.php',
	58	+ 'slim-seo/slim-seo.php',
	59	+ 'wp-seopress/seopress.php',
	60	+ 'wp-seopress-pro/seopress-pro.php',
	61	+ 'seo-key/seo-key.php',
	62	+ 'seo-key-pro/seo-key.php',
	63	+ );
	64	+
	65	+ foreach ( $conflicting_plugins as $plugin ) {
	66	+ if ( Jetpack::is_plugin_active( $plugin ) ) {
	67	+ return true;
	68	+ }
	69	+ }
	70	+
	71	+ return $disabled;
	72	+}
	73	+
	74	+/**
	75	+ * Output the canonical link tag for non-singular pages.
	76	+ *
	77	+ * WordPress core handles singular posts/pages via rel_canonical(),
	78	+ * so this function only outputs canonical tags for archive pages.
	79	+ *
	80	+ * @since 15.6
	81	+ */
	82	+function jetpack_canonical_urls_output_tag() {
	83	+ if ( is_singular() ) {
	84	+ return;
	85	+ }
	86	+
	87	+ $url = Jetpack_Canonical_Urls_Resolver::get_canonical_url();
	88	+
	89	+ if ( ! empty( $url ) ) {
	90	+ echo '<link rel="canonical" href="' . esc_url( $url ) . '" />' . "\n";
	91	+ }
	92	+}