Canonical: Introduce `wp_get_canonical_url()`.
`wp_get_canonical_url()` encapsulates the URL logic of `rel_canonical()` to provide a consistent way to retrieve the canonical URL for a post. The new filter `get_canonical_url` allows to customize the canonical URL. Props joostdevalk, jipmoors, DrewAPicture, ocean90. Fixes #36168. Built from https://develop.svn.wordpress.org/trunk@37685 git-svn-id: http://core.svn.wordpress.org/trunk@37651 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -3538,36 +3538,81 @@ function get_edit_profile_url( $user_id = 0, $scheme = 'admin' ) {
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return apply_filters( 'edit_profile_url', $url, $user_id, $scheme);
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}
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/**
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* Returns the canonical URL for a post.
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*
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* When the post is the same as the current requested page the function will handle the
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* pagination arguments too.
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*
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* @since 4.6.0
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*
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* @param int|WP_Post $post Optional. Post ID or object. Default is global `$post`.
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* @return string|false The canonical URL, or false if the post does not exist or has not
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* been published yet.
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*/
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function wp_get_canonical_url( $post = null ) {
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$post = get_post( $post );
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if ( ! $post ) {
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return false;
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}
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if ( 'publish' !== $post->post_status ) {
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return false;
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}
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$canonical_url = get_permalink( $post );
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// If a canonical is being generated for the current page, make sure it has pagination if needed.
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if ( $post->ID === get_queried_object_id() ) {
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$page = get_query_var( 'page', 0 );
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if ( $page >= 2 ) {
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if ( '' == get_option( 'permalink_structure' ) ) {
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$canonical_url = add_query_arg( 'page', $page, $canonical_url );
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} else {
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$canonical_url = trailingslashit( $canonical_url ) . user_trailingslashit( $page, 'single_paged' );
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}
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}
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$cpage = get_query_var( 'cpage', 0 );
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if ( $cpage ) {
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$canonical_url = get_comments_pagenum_link( $cpage );
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}
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}
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/**
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* Filters the canonical URL for a post.
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*
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* @since 4.6.0
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*
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* @param string $string The post's canonical URL.
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* @param WP_Post $post Post object.
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*/
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return apply_filters( 'get_canonical_url', $canonical_url, $post );
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}
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/**
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* Outputs rel=canonical for singular queries.
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*
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* @since 2.9.0
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* @since 4.6.0 Adjusted to use `wp_get_canonical_url()`.
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*/
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function rel_canonical() {
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if ( ! is_singular() ) {
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return;
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}
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if ( ! $id = get_queried_object_id() ) {
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$id = get_queried_object_id();
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if ( 0 === $id ) {
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return;
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}
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$url = get_permalink( $id );
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$url = wp_get_canonical_url( $id );
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$page = get_query_var( 'page' );
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if ( $page >= 2 ) {
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if ( '' == get_option( 'permalink_structure' ) ) {
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$url = add_query_arg( 'page', $page, $url );
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} else {
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$url = trailingslashit( $url ) . user_trailingslashit( $page, 'single_paged' );
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if ( ! empty( $url ) ) {
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echo '<link rel="canonical" href="' . esc_url( $url ) . '" />' . "\n";
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}
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}
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$cpage = get_query_var( 'cpage' );
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if ( $cpage ) {
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$url = get_comments_pagenum_link( $cpage );
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}
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echo '<link rel="canonical" href="' . esc_url( $url ) . "\" />\n";
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}
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/**
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@ -4,7 +4,7 @@
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*
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* @global string $wp_version
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*/
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$wp_version = '4.6-alpha-37684';
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$wp_version = '4.6-alpha-37685';
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/**
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* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
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