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| 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 | require_once __DIR__ . '/canonical-urls/canonical-urls-conflicts.php'; |
| 22 | |
| 23 | /** |
| 24 | * Can be used to prevent the Canonical URLs module from outputting canonical tags. |
| 25 | * |
| 26 | * @module canonical-urls |
| 27 | * |
| 28 | * @since 15.6 |
| 29 | * |
| 30 | * @param bool $disabled Whether canonical URL output is disabled. Defaults to false. |
| 31 | */ |
| 32 | if ( ! apply_filters( 'jetpack_disable_canonical_urls', false ) ) { |
| 33 | require_once __DIR__ . '/canonical-urls/class-jetpack-canonical-urls-resolver.php'; |
| 34 | add_action( 'wp_head', 'jetpack_canonical_urls_output_tag' ); |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Output the canonical link tag for non-singular pages. |
| 39 | * |
| 40 | * WordPress core handles singular posts/pages via rel_canonical(), |
| 41 | * so this function only outputs canonical tags for archive pages. |
| 42 | * |
| 43 | * @since 15.6 |
| 44 | */ |
| 45 | function jetpack_canonical_urls_output_tag() { |
| 46 | if ( is_singular() ) { |
| 47 | return; |
| 48 | } |
| 49 | |
| 50 | $url = Jetpack_Canonical_Urls_Resolver::get_canonical_url(); |
| 51 | |
| 52 | if ( ! empty( $url ) ) { |
| 53 | echo '<link rel="canonical" href="' . esc_url( $url ) . '" />' . "\n"; |
| 54 | } |
| 55 | } |