Make get_adjacent_post() wrap a new WP_Get_Adjacent_Post object that uses WP_Query.
Built from https://develop.svn.wordpress.org/trunk@27285 git-svn-id: http://core.svn.wordpress.org/trunk@27141 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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Andrew Nacin
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@ -1119,82 +1119,283 @@ function get_next_post( $in_same_term = false, $excluded_terms = '', $taxonomy =
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* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
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* @param bool $previous Optional. Whether to retrieve previous post.
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* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
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* @return mixed Post object if successful. Null if global $post is not set. Empty string if no corresponding post exists.
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* @return mixed Post object if successful. Null if current post doesn't exist. Empty string if no corresponding adjacent post exists.
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*/
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function get_adjacent_post( $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
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global $wpdb;
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if ( ( ! $post = get_post() ) || ! taxonomy_exists( $taxonomy ) )
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return null;
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$current_post_date = $post->post_date;
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$join = '';
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$posts_in_ex_terms_sql = '';
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if ( $in_same_term || ! empty( $excluded_terms ) ) {
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$join = " INNER JOIN $wpdb->term_relationships AS tr ON p.ID = tr.object_id INNER JOIN $wpdb->term_taxonomy tt ON tr.term_taxonomy_id = tt.term_taxonomy_id";
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if ( $in_same_term ) {
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if ( ! is_object_in_taxonomy( $post->post_type, $taxonomy ) )
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return '';
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$term_array = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'ids' ) );
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if ( ! $term_array || is_wp_error( $term_array ) )
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return '';
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$join .= $wpdb->prepare( " AND tt.taxonomy = %s AND tt.term_id IN (" . implode( ',', array_map( 'intval', $term_array ) ) . ")", $taxonomy );
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}
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$posts_in_ex_terms_sql = $wpdb->prepare( "AND tt.taxonomy = %s", $taxonomy );
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if ( ! empty( $excluded_terms ) ) {
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if ( ! is_array( $excluded_terms ) ) {
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// back-compat, $excluded_terms used to be $excluded_terms with IDs separated by " and "
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if ( false !== strpos( $excluded_terms, ' and ' ) ) {
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if ( is_string( $excluded_terms ) && false !== strpos( $excluded_terms, ' and ' ) ) {
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// back-compat: $excluded_terms used to be IDs separated by " and "
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_deprecated_argument( __FUNCTION__, '3.3', sprintf( __( 'Use commas instead of %s to separate excluded terms.' ), "'and'" ) );
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$excluded_terms = explode( ' and ', $excluded_terms );
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}
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if ( $excluded_terms ) {
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$excluded_terms = wp_parse_id_list( $excluded_terms );
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} else {
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$excluded_terms = explode( ',', $excluded_terms );
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$excluded_terms = array();
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}
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$adjacent = new WP_Get_Adjacent_Post( array(
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'post' => get_post(),
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'previous' => $previous,
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'taxonomy' => $taxonomy,
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'in_same_term' => $in_same_term,
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'excluded_terms' => $excluded_terms,
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) );
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return $adjacent->adjacent_post;
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}
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/**
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* WordPress Adjacent Post API
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*
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* Based on the current or specified post, determines either the previous or
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* next post based on the criteria specified. Supports retrieving posts with the
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* same taxonomy terms and posts that lack specific terms.
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*/
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class WP_Get_Adjacent_Post {
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public $adjacent_post = null;
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protected $current_post = false;
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protected $adjacent = 'previous';
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protected $taxonomy = 'category';
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protected $in_same_term = false;
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protected $excluded_terms = '';
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/**
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* Class constructor.
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*
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* The post is queried is run if arguments are passed to the constructor.
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* Otherwise, the get_post() method will need to be called.
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*
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* @param array $args Optional. See the get_post() method for $args.
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*/
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public function __construct( $args = array() ) {
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if ( empty( $args ) ) {
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return;
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}
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$this->get_post( $args );
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}
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/**
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* Allow direct access to adjacent post from the class instance itself
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*
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* @param string $property
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* @return mixed String when adjacent post is found and post property exists. Null when no adjacent post is found.
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*/
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public function __get( $property ) {
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if ( is_object( $this->adjacent_post ) && property_exists( $this->adjacent_post, $property ) ) {
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return $this->adjacent_post->{$property};
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} else {
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return null;
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}
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}
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$excluded_terms = array_map( 'intval', $excluded_terms );
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/**
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* Determine adjacent post for specified post and adjacency.
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*
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* @since 3.9.0
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*
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* @param array $args {
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* Arguments for querying the adjacent post.
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*
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* @type mixed $post Optional. Post object or ID to find adjacent post for.
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* @type bool $previous Optional. Whether to retrieve previous post.
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* @type string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
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* @type bool $in_same_term Optional. Whether post should be in a same taxonomy term.
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* @type array $excluded_terms Optional. Array of excluded term IDs.
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* }
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* @return mixed Post object on success. False if no adjacent post exists. Null on failure.
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*/
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protected function get_post( $args ) {
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$this->current_post = get_post( $args['post'] );
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$this->excluded_terms = array_map( 'intval', $args['excluded_terms'] );
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$this->adjacent = $args['previous'] ? 'previous' : 'next';
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$this->in_same_term = (bool) $args['in_same_term'];
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if ( ! empty( $term_array ) ) {
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$excluded_terms = array_diff( $excluded_terms, $term_array );
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$posts_in_ex_terms_sql = '';
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// Return null when either the post or taxonomy doesn't exist.
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if ( ! $this->current_post ) {
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return;
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}
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if ( ! empty( $excluded_terms ) ) {
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$posts_in_ex_terms_sql = $wpdb->prepare( " AND tt.taxonomy = %s AND tt.term_id NOT IN (" . implode( $excluded_terms, ',' ) . ')', $taxonomy );
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if ( $this->in_same_term || $this->excluded_terms ) {
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if ( ! taxonomy_exists( $args['taxonomy'] ) ) {
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return;
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}
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}
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// Build our arguments for WP_Query.
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$query_args = array(
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'posts_per_page' => 1,
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'post_status' => 'publish',
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'post_type' => 'post',
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'orderby' => 'date',
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'order' => 'previous' === $this->adjacent ? 'DESC' : 'ASC',
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'no_found_rows' => true,
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'cache_results' => true,
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'date_query' => array(),
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);
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$tax_query = array();
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// Set up for requests limited to posts that share terms.
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if ( $this->in_same_term ) {
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$terms = get_the_terms( $this->current_post->ID, $args['taxonomy'] );
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if ( is_array( $terms ) && ! empty( $terms ) ) {
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$terms = wp_list_pluck( $terms, 'term_id' );
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$terms = array_values( $terms );
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$terms = array_map( 'intval', $terms );
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} else {
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unset( $terms );
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}
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}
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$adjacent = $previous ? 'previous' : 'next';
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$op = $previous ? '<' : '>';
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$order = $previous ? 'DESC' : 'ASC';
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$join = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_term, $excluded_terms );
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$where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare( "WHERE p.post_date $op %s AND p.post_type = %s AND p.post_status = 'publish' $posts_in_ex_terms_sql", $current_post_date, $post->post_type), $in_same_term, $excluded_terms );
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$sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" );
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$query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort";
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$query_key = 'adjacent_post_' . md5( $query );
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$result = wp_cache_get( $query_key, 'counts' );
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if ( false !== $result ) {
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if ( $result )
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$result = get_post( $result );
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return $result;
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// Handle excluded terms.
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if ( $this->excluded_terms ) {
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$tax_query[] = array(
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'taxonomy' => $args['taxonomy'],
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'slugs' => $this->excluded_terms,
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'compare' => 'NOT IN',
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);
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}
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$result = $wpdb->get_var( $query );
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if ( null === $result )
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$result = '';
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// If requesting same term, ensure excluded terms don't appear in term list.
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if ( isset( $terms ) ) {
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if ( isset( $this->excluded_terms ) && is_array( $this->excluded_terms ) ) {
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$terms = array_diff( $terms, $this->excluded_terms );
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}
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wp_cache_set( $query_key, $result, 'counts' );
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if ( ! empty( $terms ) ) {
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$tax_query[] = array(
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'taxonomy' => $args['taxonomy'],
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'terms' => $terms,
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);
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}
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}
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if ( $result )
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$result = get_post( $result );
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// If we have a tax query, add it to our query args.
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if ( $tax_query ) {
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$query_args['tax_query'] = $tax_query;
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}
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return $result;
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// And now, the date constraint.
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$date_query_key = 'previous' === $this->adjacent ? 'before' : 'after';
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$query_args['date_query'][] = array(
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$date_query_key => $this->current_post->post_date,
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'inclusive' => true,
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);
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// Ensure the current post isn't returned, since we're using an inclusive date query.
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$query_args['post__not_in'] = array( $this->current_post->ID );
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/**
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* Filter the arguments passed to WP_Query when finding an adjacent post.
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*
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* @since 3.9.0
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*
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* @param array $query_args WP_Query arguments.
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* @param array $args Arguments passed to WP_Get_Adjacent_Post.
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*/
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$query_args = apply_filters( 'get_adjacent_post_query_args', $query_args, $args );
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add_filter( 'posts_clauses', array( $this, 'filter' ) );
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$query = new WP_Query( $query_args );
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if ( $query->posts ) {
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$this->adjacent_post = $query->post;
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} else {
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$this->adjacent_post = false;
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}
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}
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/**
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* Apply the deprecated filters to WP_Query's clauses.
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*
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* @param array $clauses
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* @uses $this->filter_join_and_where()
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* @uses $this->filter_sort()
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* @filter post_clauses
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* @return array
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*/
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public function filter( $clauses ) {
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// Immediately deregister these legacy filters to avoid modifying
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// any calls to WP_Query from filter callbacks hooked to WP_Query filters.
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remove_filter( 'posts_clauses', array( $this, 'filter' ) );
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// The `join` and `where` filters are identical in their parameters,
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// so we can use the same approach for both.
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foreach ( array( 'join', 'where' ) as $clause ) {
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if ( has_filter( 'get_' . $this->adjacent . '_post_' . $clause ) ) {
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$clauses[ $clause ] = $this->filter_join_and_where( $clauses[ $clause ], $clause );
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}
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}
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// The legacy `sort` filter combined the ORDER BY and LIMIT clauses,
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// while `WP_Query` does not, which requires special handling.
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if ( has_filter( 'get_' . $this->adjacent . '_post_sort' ) ) {
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$sort_clauses = $this->filter_sort( $clauses['orderby'], $clauses['limits'] );
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$clauses = array_merge( $clauses, $sort_clauses );
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}
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return $clauses;
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}
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/**
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* Apply the deprecated `join` or `where` clause filter to the clauses built by WP_Query.
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*
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* @param string $value
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* @param string $clause
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* @return string
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*/
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protected function filter_join_and_where( $value, $clause ) {
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/**
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* @deprecated 3.9.0
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*/
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return apply_filters( 'get_' . $this->adjacent . '_post_' . $clause, $value, $this->in_same_term, $this->excluded_terms );
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}
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/**
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* Apply deprecated `sort` filter, which applies to both the ORDER BY and LIMIT clauses.
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*
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* @param string $orderby
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* @param string $limits
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* @return array
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*/
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protected function filter_sort( $orderby, $limits ) {
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/**
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* @deprecated 3.9.0
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*/
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$sort = apply_filters( 'get_' . $this->adjacent . '_post_sort', 'ORDER BY ' . $orderby . ' ' . $limits );
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if ( empty( $sort ) ) {
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return compact( 'orderby', 'limits' );
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}
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// The legacy filter could allow either clause to be removed, or their order inverted, so we need to know what we have and where.
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$has_order_by = stripos( $sort, 'order by' );
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$has_limit = stripos( $sort, 'limit' );
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// Split the string of one or two clauses into their respective array keys
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if ( false !== $has_order_by && false !== $has_limit ) {
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// The LIMIT clause cannot appear before the ORDER BY clause in a valid query
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// However, since the legacy filter would allow a user to invert the order, we maintain that handling so the same errors are triggered.
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if ( $has_order_by < $has_limit ) {
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$orderby = trim( str_ireplace( 'order by', '', substr( $sort, 0, $has_limit ) ) );
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$limits = trim( substr( $sort, $has_limit ) );
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} else {
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$orderby = trim( str_ireplace( 'order by', '', substr( $sort, $has_order_by ) ) );
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$limits = trim( substr( $sort, 0, $has_order_by ) );
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}
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} elseif ( false !== $has_order_by ) {
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$orderby = trim( str_ireplace( 'order by', '', $sort ) );
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$limits = '';
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} elseif ( false !== $has_limit ) {
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$orderby = '';
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$limits = trim( $sort );
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}
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return compact( 'orderby', 'limits' );
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}
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}
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/**
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