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<?php /** * Module Name: Canonical URLs * Module Description: Add canonical URL tags to archive pages to prevent duplicate content in search engines. * Sort Order: 36 * First Introduced: 15.6 * Requires Connection: No * Requires User Connection: No * Auto Activate: No * Module Tags: Traffic * Feature: Traffic * Additional Search Queries: canonical, seo, duplicate content, woocommerce, archive * * @package automattic/jetpack */ if ( ! defined( 'ABSPATH' ) ) { exit( 0 ); } // Disable canonical URL output when a conflicting SEO plugin is active. add_filter( 'jetpack_disable_canonical_urls', 'jetpack_canonical_urls_check_conflicts' ); /** * Can be used to prevent the Canonical URLs module from outputting canonical tags. * * @module canonical-urls * * @since 15.6 * * @param bool $disabled Whether canonical URL output is disabled. Defaults to false. */ if ( ! apply_filters( 'jetpack_disable_canonical_urls', false ) ) { require_once __DIR__ . '/canonical-urls/class-jetpack-canonical-urls-resolver.php'; add_action( 'wp_head', 'jetpack_canonical_urls_output_tag' ); } /** * Check if a conflicting SEO plugin is active and disable canonical URL output. * * @since 15.6 * * @param bool $disabled Whether canonical URL output is already disabled. * @return bool Whether canonical URL output should be disabled. */ function jetpack_canonical_urls_check_conflicts( $disabled ) { if ( $disabled ) { return $disabled; } $conflicting_plugins = array( 'wordpress-seo/wp-seo.php', 'wordpress-seo-premium/wp-seo-premium.php', 'all-in-one-seo-pack/all_in_one_seo_pack.php', 'all-in-one-seo-pack-pro/all_in_one_seo_pack.php', 'seo-by-rank-math/rank-math.php', 'autodescription/autodescription.php', 'slim-seo/slim-seo.php', 'wp-seopress/seopress.php', 'wp-seopress-pro/seopress-pro.php', 'seo-key/seo-key.php', 'seo-key-pro/seo-key.php', ); foreach ( $conflicting_plugins as $plugin ) { if ( Jetpack::is_plugin_active( $plugin ) ) { return true; } } return $disabled; } /** * Output the canonical link tag for non-singular pages. * * WordPress core handles singular posts/pages via rel_canonical(), * so this function only outputs canonical tags for archive pages. * * @since 15.6 */ function jetpack_canonical_urls_output_tag() { if ( is_singular() ) { return; } $url = Jetpack_Canonical_Urls_Resolver::get_canonical_url(); if ( ! empty( $url ) ) { echo '<link rel="canonical" href="' . esc_url( $url ) . '" />' . "\n"; } }
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