current post in the loop. */ $categories = apply_filters( 'the_category_list', get_the_category( $post_id ), $post_id ); if ( empty( $categories ) ) { /** This filter is documented in wp-includes/category-template.php */ return apply_filters( 'the_category', __( 'Uncategorized' ), $separator, $parents ); } $rel = ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) ? 'rel="category tag"' : 'rel="category"'; $thelist = ''; if ( '' == $separator ) { $thelist .= ''; } else { $i = 0; foreach ( $categories as $category ) { if ( 0 < $i ) $thelist .= $separator; switch ( strtolower( $parents ) ) { case 'multiple': if ( $category->parent ) $thelist .= get_category_parents( $category->parent, true, $separator ); $thelist .= '' . $category->name.''; break; case 'single': $thelist .= ''; if ( $category->parent ) $thelist .= get_category_parents( $category->parent, false, $separator ); $thelist .= "$category->name"; break; case '': default: $thelist .= '' . $category->name.''; } ++$i; } } /** * Filters the category or list of categories. * * @since 1.2.0 * * @param string $thelist List of categories for the current post. * @param string $separator Separator used between the categories. * @param string $parents How to display the category parents. Accepts 'multiple', * 'single', or empty. */ return apply_filters( 'the_category', $thelist, $separator, $parents ); } /** * Check if the current post is within any of the given categories. * * The given categories are checked against the post's categories' term_ids, names and slugs. * Categories given as integers will only be checked against the post's categories' term_ids. * * Prior to v2.5 of WordPress, category names were not supported. * Prior to v2.7, category slugs were not supported. * Prior to v2.7, only one category could be compared: in_category( $single_category ). * Prior to v2.7, this function could only be used in the WordPress Loop. * As of 2.7, the function can be used anywhere if it is provided a post ID or post object. * * @since 1.2.0 * * @param int|string|array $category Category ID, name or slug, or array of said. * @param int|object $post Optional. Post to check instead of the current post. (since 2.7.0) * @return bool True if the current post is in any of the given categories. */ function in_category( $category, $post = null ) { if ( empty( $category ) ) return false; return has_category( $category, $post ); } /** * Display category list for a post in either HTML list or custom format. * * @since 0.71 * * @param string $separator Optional. Separator between the categories. By default, the links are placed * in an unordered list. An empty string will result in the default behavior. * @param string $parents Optional. How to display the parents. * @param int $post_id Optional. Post ID to retrieve categories. */ function the_category( $separator = '', $parents = '', $post_id = false ) { echo get_the_category_list( $separator, $parents, $post_id ); } /** * Retrieve category description. * * @since 1.0.0 * * @param int $category Optional. Category ID. Will use global category ID by default. * @return string Category description, available. */ function category_description( $category = 0 ) { return term_description( $category, 'category' ); } /** * Display or retrieve the HTML dropdown list of categories. * * The 'hierarchical' argument, which is disabled by default, will override the * depth argument, unless it is true. When the argument is false, it will * display all of the categories. When it is enabled it will use the value in * the 'depth' argument. * * @since 2.1.0 * @since 4.2.0 Introduced the `value_field` argument. * @since 4.6.0 Introduced the `required` argument. * * @param string|array $args { * Optional. Array or string of arguments to generate a categories drop-down element. See WP_Term_Query::__construct() * for information on additional accepted arguments. * * @type string $show_option_all Text to display for showing all categories. Default empty. * @type string $show_option_none Text to display for showing no categories. Default empty. * @type string $option_none_value Value to use when no category is selected. Default empty. * @type string $orderby Which column to use for ordering categories. See get_terms() for a list * of accepted values. Default 'id' (term_id). * @type bool $pad_counts See get_terms() for an argument description. Default false. * @type bool|int $show_count Whether to include post counts. Accepts 0, 1, or their bool equivalents. * Default 0. * @type bool|int $echo Whether to echo or return the generated markup. Accepts 0, 1, or their * bool equivalents. Default 1. * @type bool|int $hierarchical Whether to traverse the taxonomy hierarchy. Accepts 0, 1, or their bool * equivalents. Default 0. * @type int $depth Maximum depth. Default 0. * @type int $tab_index Tab index for the select element. Default 0 (no tabindex). * @type string $name Value for the 'name' attribute of the select element. Default 'cat'. * @type string $id Value for the 'id' attribute of the select element. Defaults to the value * of `$name`. * @type string $class Value for the 'class' attribute of the select element. Default 'postform'. * @type int|string $selected Value of the option that should be selected. Default 0. * @type string $value_field Term field that should be used to populate the 'value' attribute * of the option elements. Accepts any valid term field: 'term_id', 'name', * 'slug', 'term_group', 'term_taxonomy_id', 'taxonomy', 'description', * 'parent', 'count'. Default 'term_id'. * @type string|array $taxonomy Name of the category or categories to retrieve. Default 'category'. * @type bool $hide_if_empty True to skip generating markup if no categories are found. * Default false (create select element even if no categories are found). * @type bool $required Whether the `\n"; } else { $output = ''; } if ( empty( $categories ) && ! $r['hide_if_empty'] && ! empty( $r['show_option_none'] ) ) { /** * Filters a taxonomy drop-down display element. * * A variety of taxonomy drop-down display elements can be modified * just prior to display via this filter. Filterable arguments include * 'show_option_none', 'show_option_all', and various forms of the * term name. * * @since 1.2.0 * * @see wp_dropdown_categories() * * @param string $element Category name. * @param WP_Term|null $category The category object, or null if there's no corresponding category. */ $show_option_none = apply_filters( 'list_cats', $r['show_option_none'], null ); $output .= "\t\n"; } if ( ! empty( $categories ) ) { if ( $r['show_option_all'] ) { /** This filter is documented in wp-includes/category-template.php */ $show_option_all = apply_filters( 'list_cats', $r['show_option_all'], null ); $selected = ( '0' === strval($r['selected']) ) ? " selected='selected'" : ''; $output .= "\t\n"; } if ( $r['show_option_none'] ) { /** This filter is documented in wp-includes/category-template.php */ $show_option_none = apply_filters( 'list_cats', $r['show_option_none'], null ); $selected = selected( $option_none_value, $r['selected'], false ); $output .= "\t\n"; } if ( $r['hierarchical'] ) { $depth = $r['depth']; // Walk the full depth. } else { $depth = -1; // Flat. } $output .= walk_category_dropdown_tree( $categories, $depth, $r ); } if ( ! $r['hide_if_empty'] || ! empty( $categories ) ) { $output .= "\n"; } /** * Filters the taxonomy drop-down output. * * @since 2.1.0 * * @param string $output HTML output. * @param array $r Arguments used to build the drop-down. */ $output = apply_filters( 'wp_dropdown_cats', $output, $r ); if ( $r['echo'] ) { echo $output; } return $output; } /** * Display or retrieve the HTML list of categories. * * @since 2.1.0 * @since 4.4.0 Introduced the `hide_title_if_empty` and `separator` arguments. The `current_category` argument was modified to * optionally accept an array of values. * * @param string|array $args { * Array of optional arguments. * * @type int $child_of Term ID to retrieve child terms of. See get_terms(). Default 0. * @type int|array $current_category ID of category, or array of IDs of categories, that should get the * 'current-cat' class. Default 0. * @type int $depth Category depth. Used for tab indentation. Default 0. * @type bool|int $echo True to echo markup, false to return it. Default 1. * @type array|string $exclude Array or comma/space-separated string of term IDs to exclude. * If `$hierarchical` is true, descendants of `$exclude` terms will also * be excluded; see `$exclude_tree`. See get_terms(). * Default empty string. * @type array|string $exclude_tree Array or comma/space-separated string of term IDs to exclude, along * with their descendants. See get_terms(). Default empty string. * @type string $feed Text to use for the feed link. Default 'Feed for all posts filed * under [cat name]'. * @type string $feed_image URL of an image to use for the feed link. Default empty string. * @type string $feed_type Feed type. Used to build feed link. See get_term_feed_link(). * Default empty string (default feed). * @type bool|int $hide_empty Whether to hide categories that don't have any posts attached to them. * Default 1. * @type bool $hide_title_if_empty Whether to hide the `$title_li` element if there are no terms in * the list. Default false (title will always be shown). * @type bool $hierarchical Whether to include terms that have non-empty descendants. * See get_terms(). Default true. * @type string $order Which direction to order categories. Accepts 'ASC' or 'DESC'. * Default 'ASC'. * @type string $orderby The column to use for ordering categories. Default 'name'. * @type string $separator Separator between links. Default '
'. * @type bool|int $show_count Whether to show how many posts are in the category. Default 0. * @type string $show_option_all Text to display for showing all categories. Default empty string. * @type string $show_option_none Text to display for the 'no categories' option. * Default 'No categories'. * @type string $style The style used to display the categories list. If 'list', categories * will be output as an unordered list. If left empty or another value, * categories will be output separated by `
` tags. Default 'list'. * @type string $taxonomy Taxonomy name. Default 'category'. * @type string $title_li Text to use for the list title `
  • ` element. Pass an empty string * to disable. Default 'Categories'. * @type bool|int $use_desc_for_title Whether to use the category description as the title attribute. * Default 1. * } * @return false|string HTML content only if 'echo' argument is 0. */ function wp_list_categories( $args = '' ) { $defaults = array( 'child_of' => 0, 'current_category' => 0, 'depth' => 0, 'echo' => 1, 'exclude' => '', 'exclude_tree' => '', 'feed' => '', 'feed_image' => '', 'feed_type' => '', 'hide_empty' => 1, 'hide_title_if_empty' => false, 'hierarchical' => true, 'order' => 'ASC', 'orderby' => 'name', 'separator' => '
    ', 'show_count' => 0, 'show_option_all' => '', 'show_option_none' => __( 'No categories' ), 'style' => 'list', 'taxonomy' => 'category', 'title_li' => __( 'Categories' ), 'use_desc_for_title' => 1, ); $r = wp_parse_args( $args, $defaults ); if ( !isset( $r['pad_counts'] ) && $r['show_count'] && $r['hierarchical'] ) $r['pad_counts'] = true; // Descendants of exclusions should be excluded too. if ( true == $r['hierarchical'] ) { $exclude_tree = array(); if ( $r['exclude_tree'] ) { $exclude_tree = array_merge( $exclude_tree, wp_parse_id_list( $r['exclude_tree'] ) ); } if ( $r['exclude'] ) { $exclude_tree = array_merge( $exclude_tree, wp_parse_id_list( $r['exclude'] ) ); } $r['exclude_tree'] = $exclude_tree; $r['exclude'] = ''; } if ( ! isset( $r['class'] ) ) $r['class'] = ( 'category' == $r['taxonomy'] ) ? 'categories' : $r['taxonomy']; if ( ! taxonomy_exists( $r['taxonomy'] ) ) { return false; } $show_option_all = $r['show_option_all']; $show_option_none = $r['show_option_none']; $categories = get_categories( $r ); $output = ''; if ( $r['title_li'] && 'list' == $r['style'] && ( ! empty( $categories ) || ! $r['hide_title_if_empty'] ) ) { $output = '
  • ' . $r['title_li'] . '
    • '; } /** * Filters the HTML output of a taxonomy list. * * @since 2.1.0 * * @param string $output HTML output. * @param array $args An array of taxonomy-listing arguments. */ $html = apply_filters( 'wp_list_categories', $output, $args ); if ( $r['echo'] ) { echo $html; } else { return $html; } } /** * Display tag cloud. * * The text size is set by the 'smallest' and 'largest' arguments, which will * use the 'unit' argument value for the CSS text size unit. The 'format' * argument can be 'flat' (default), 'list', or 'array'. The flat value for the * 'format' argument will separate tags with spaces. The list value for the * 'format' argument will format the tags in a UL HTML list. The array value for * the 'format' argument will return in PHP array type format. * * The 'orderby' argument will accept 'name' or 'count' and defaults to 'name'. * The 'order' is the direction to sort, defaults to 'ASC' and can be 'DESC'. * * The 'number' argument is how many tags to return. By default, the limit will * be to return the top 45 tags in the tag cloud list. * * The 'topic_count_text' argument is a nooped plural from _n_noop() to generate the * text for the tag link count. * * The 'topic_count_text_callback' argument is a function, which given the count * of the posts with that tag returns a text for the tag link count. * * The 'post_type' argument is used only when 'link' is set to 'edit'. It determines the post_type * passed to edit.php for the popular tags edit links. * * The 'exclude' and 'include' arguments are used for the get_tags() function. Only one * should be used, because only one will be used and the other ignored, if they are both set. * * @since 2.3.0 * @since 4.8.0 Added the `show_count` argument. * * @param array|string|null $args Optional. Override default arguments. * @return void|array Generated tag cloud, only if no failures and 'array' is set for the 'format' argument. * Otherwise, this function outputs the tag cloud. */ function wp_tag_cloud( $args = '' ) { $defaults = array( 'smallest' => 8, 'largest' => 22, 'unit' => 'pt', 'number' => 45, 'format' => 'flat', 'separator' => "\n", 'orderby' => 'name', 'order' => 'ASC', 'exclude' => '', 'include' => '', 'link' => 'view', 'taxonomy' => 'post_tag', 'post_type' => '', 'echo' => true, 'show_count' => 0, ); $args = wp_parse_args( $args, $defaults ); $tags = get_terms( $args['taxonomy'], array_merge( $args, array( 'orderby' => 'count', 'order' => 'DESC' ) ) ); // Always query top tags if ( empty( $tags ) || is_wp_error( $tags ) ) return; foreach ( $tags as $key => $tag ) { if ( 'edit' == $args['link'] ) $link = get_edit_term_link( $tag->term_id, $tag->taxonomy, $args['post_type'] ); else $link = get_term_link( intval($tag->term_id), $tag->taxonomy ); if ( is_wp_error( $link ) ) return; $tags[ $key ]->link = $link; $tags[ $key ]->id = $tag->term_id; } $return = wp_generate_tag_cloud( $tags, $args ); // Here's where those top tags get sorted according to $args /** * Filters the tag cloud output. * * @since 2.3.0 * * @param string $return HTML output of the tag cloud. * @param array $args An array of tag cloud arguments. */ $return = apply_filters( 'wp_tag_cloud', $return, $args ); if ( 'array' == $args['format'] || empty($args['echo']) ) return $return; echo $return; } /** * Default topic count scaling for tag links. * * @since 2.9.0 * * @param int $count Number of posts with that tag. * @return int Scaled count. */ function default_topic_count_scale( $count ) { return round(log10($count + 1) * 100); } /** * Generates a tag cloud (heatmap) from provided data. * * @todo Complete functionality. * @since 2.3.0 * @since 4.8.0 Added the `show_count` argument. * * @param array $tags List of tags. * @param string|array $args { * Optional. Array of string of arguments for generating a tag cloud. * * @type int $smallest Smallest font size used to display tags. Paired * with the value of `$unit`, to determine CSS text * size unit. Default 8 (pt). * @type int $largest Largest font size used to display tags. Paired * with the value of `$unit`, to determine CSS text * size unit. Default 22 (pt). * @type string $unit CSS text size unit to use with the `$smallest` * and `$largest` values. Accepts any valid CSS text * size unit. Default 'pt'. * @type int $number The number of tags to return. Accepts any * positive integer or zero to return all. * Default 0. * @type string $format Format to display the tag cloud in. Accepts 'flat' * (tags separated with spaces), 'list' (tags displayed * in an unordered list), or 'array' (returns an array). * Default 'flat'. * @type string $separator HTML or text to separate the tags. Default "\n" (newline). * @type string $orderby Value to order tags by. Accepts 'name' or 'count'. * Default 'name'. The {@see 'tag_cloud_sort'} filter * can also affect how tags are sorted. * @type string $order How to order the tags. Accepts 'ASC' (ascending), * 'DESC' (descending), or 'RAND' (random). Default 'ASC'. * @type int|bool $filter Whether to enable filtering of the final output * via {@see 'wp_generate_tag_cloud'}. Default 1|true. * @type string $topic_count_text Nooped plural text from _n_noop() to supply to * tag counts. Default null. * @type callable $topic_count_text_callback Callback used to generate nooped plural text for * tag counts based on the count. Default null. * @type callable $topic_count_scale_callback Callback used to determine the tag count scaling * value. Default default_topic_count_scale(). * @type bool|int $show_count Whether to display the tag counts. Default 0. Accepts * 0, 1, or their bool equivalents. * } * @return string|array Tag cloud as a string or an array, depending on 'format' argument. */ function wp_generate_tag_cloud( $tags, $args = '' ) { $defaults = array( 'smallest' => 8, 'largest' => 22, 'unit' => 'pt', 'number' => 0, 'format' => 'flat', 'separator' => "\n", 'orderby' => 'name', 'order' => 'ASC', 'topic_count_text' => null, 'topic_count_text_callback' => null, 'topic_count_scale_callback' => 'default_topic_count_scale', 'filter' => 1, 'show_count' => 0, ); $args = wp_parse_args( $args, $defaults ); $return = ( 'array' === $args['format'] ) ? array() : ''; if ( empty( $tags ) ) { return $return; } // Juggle topic counts. if ( isset( $args['topic_count_text'] ) ) { // First look for nooped plural support via topic_count_text. $translate_nooped_plural = $args['topic_count_text']; } elseif ( ! empty( $args['topic_count_text_callback'] ) ) { // Look for the alternative callback style. Ignore the previous default. if ( $args['topic_count_text_callback'] === 'default_topic_count_text' ) { $translate_nooped_plural = _n_noop( '%s item', '%s items' ); } else { $translate_nooped_plural = false; } } elseif ( isset( $args['single_text'] ) && isset( $args['multiple_text'] ) ) { // If no callback exists, look for the old-style single_text and multiple_text arguments. $translate_nooped_plural = _n_noop( $args['single_text'], $args['multiple_text'] ); } else { // This is the default for when no callback, plural, or argument is passed in. $translate_nooped_plural = _n_noop( '%s item', '%s items' ); } /** * Filters how the items in a tag cloud are sorted. * * @since 2.8.0 * * @param array $tags Ordered array of terms. * @param array $args An array of tag cloud arguments. */ $tags_sorted = apply_filters( 'tag_cloud_sort', $tags, $args ); if ( empty( $tags_sorted ) ) { return $return; } if ( $tags_sorted !== $tags ) { $tags = $tags_sorted; unset( $tags_sorted ); } else { if ( 'RAND' === $args['order'] ) { shuffle( $tags ); } else { // SQL cannot save you; this is a second (potentially different) sort on a subset of data. if ( 'name' === $args['orderby'] ) { uasort( $tags, '_wp_object_name_sort_cb' ); } else { uasort( $tags, '_wp_object_count_sort_cb' ); } if ( 'DESC' === $args['order'] ) { $tags = array_reverse( $tags, true ); } } } if ( $args['number'] > 0 ) $tags = array_slice( $tags, 0, $args['number'] ); $counts = array(); $real_counts = array(); // For the alt tag foreach ( (array) $tags as $key => $tag ) { $real_counts[ $key ] = $tag->count; $counts[ $key ] = call_user_func( $args['topic_count_scale_callback'], $tag->count ); } $min_count = min( $counts ); $spread = max( $counts ) - $min_count; if ( $spread <= 0 ) $spread = 1; $font_spread = $args['largest'] - $args['smallest']; if ( $font_spread < 0 ) $font_spread = 1; $font_step = $font_spread / $spread; $aria_label = false; /* * Determine whether to output an 'aria-label' attribute with the tag name and count. * When tags have a different font size, they visually convey an important information * that should be available to assistive technologies too. On the other hand, sometimes * themes set up the Tag Cloud to display all tags with the same font size (setting * the 'smallest' and 'largest' arguments to the same value). * In order to always serve the same content to all users, the 'aria-label' gets printed out: * - when tags have a different size * - when the tag count is displayed (for example when users check the checkbox in the * Tag Cloud widget), regardless of the tags font size */ if ( $args['show_count'] || 0 !== $font_spread ) { $aria_label = true; } // Assemble the data that will be used to generate the tag cloud markup. $tags_data = array(); foreach ( $tags as $key => $tag ) { $tag_id = isset( $tag->id ) ? $tag->id : $key; $count = $counts[ $key ]; $real_count = $real_counts[ $key ]; if ( $translate_nooped_plural ) { $formatted_count = sprintf( translate_nooped_plural( $translate_nooped_plural, $real_count ), number_format_i18n( $real_count ) ); } else { $formatted_count = call_user_func( $args['topic_count_text_callback'], $real_count, $tag, $args ); } $tags_data[] = array( 'id' => $tag_id, 'url' => '#' != $tag->link ? $tag->link : '#', 'role' => '#' != $tag->link ? '' : ' role="button"', 'name' => $tag->name, 'formatted_count' => $formatted_count, 'slug' => $tag->slug, 'real_count' => $real_count, 'class' => 'tag-cloud-link tag-link-' . $tag_id, 'font_size' => $args['smallest'] + ( $count - $min_count ) * $font_step, 'aria_label' => $aria_label ? sprintf( ' aria-label="%1$s (%2$s)"', esc_attr( $tag->name ), esc_attr( $formatted_count ) ) : '', 'show_count' => $args['show_count'] ? ' (' . $real_count . ')' : '', ); } /** * Filters the data used to generate the tag cloud. * * @since 4.3.0 * * @param array $tags_data An array of term data for term used to generate the tag cloud. */ $tags_data = apply_filters( 'wp_generate_tag_cloud_data', $tags_data ); $a = array(); // Generate the output links array. foreach ( $tags_data as $key => $tag_data ) { $class = $tag_data['class'] . ' tag-link-position-' . ( $key + 1 ); $a[] = sprintf( '%6$s%7$s', esc_url( $tag_data['url'] ), $tag_data['role'], esc_attr( $class ), esc_attr( str_replace( ',', '.', $tag_data['font_size'] ) . $args['unit'] ), $tag_data['aria_label'], esc_html( $tag_data['name'] ), $tag_data['show_count'] ); } switch ( $args['format'] ) { case 'array' : $return =& $a; break; case 'list' : /* * Force role="list", as some browsers (sic: Safari 10) don't expose to assistive * technologies the default role when the list is styled with `list-style: none`. * Note: this is redundant but doesn't harm. */ $return = "\n"; break; default : $return = join( $args['separator'], $a ); break; } if ( $args['filter'] ) { /** * Filters the generated output of a tag cloud. * * The filter is only evaluated if a true value is passed * to the $filter argument in wp_generate_tag_cloud(). * * @since 2.3.0 * * @see wp_generate_tag_cloud() * * @param array|string $return String containing the generated HTML tag cloud output * or an array of tag links if the 'format' argument * equals 'array'. * @param array $tags An array of terms used in the tag cloud. * @param array $args An array of wp_generate_tag_cloud() arguments. */ return apply_filters( 'wp_generate_tag_cloud', $return, $tags, $args ); } else return $return; } /** * Serves as a callback for comparing objects based on name. * * Used with `uasort()`. * * @since 3.1.0 * @access private * * @param object $a The first object to compare. * @param object $b The second object to compare. * @return int Negative number if `$a->name` is less than `$b->name`, zero if they are equal, * or greater than zero if `$a->name` is greater than `$b->name`. */ function _wp_object_name_sort_cb( $a, $b ) { return strnatcasecmp( $a->name, $b->name ); } /** * Serves as a callback for comparing objects based on count. * * Used with `uasort()`. * * @since 3.1.0 * @access private * * @param object $a The first object to compare. * @param object $b The second object to compare. * @return bool Whether the count value for `$a` is greater than the count value for `$b`. */ function _wp_object_count_sort_cb( $a, $b ) { return ( $a->count > $b->count ); } // // Helper functions // /** * Retrieve HTML list content for category list. * * @uses Walker_Category to create HTML list content. * @since 2.1.0 * @see Walker_Category::walk() for parameters and return description. * @return string */ function walk_category_tree() { $args = func_get_args(); // the user's options are the third parameter if ( empty( $args[2]['walker'] ) || ! ( $args[2]['walker'] instanceof Walker ) ) { $walker = new Walker_Category; } else { $walker = $args[2]['walker']; } return call_user_func_array( array( $walker, 'walk' ), $args ); } /** * Retrieve HTML dropdown (select) content for category list. * * @uses Walker_CategoryDropdown to create HTML dropdown content. * @since 2.1.0 * @see Walker_CategoryDropdown::walk() for parameters and return description. * @return string */ function walk_category_dropdown_tree() { $args = func_get_args(); // the user's options are the third parameter if ( empty( $args[2]['walker'] ) || ! ( $args[2]['walker'] instanceof Walker ) ) { $walker = new Walker_CategoryDropdown; } else { $walker = $args[2]['walker']; } return call_user_func_array( array( $walker, 'walk' ), $args ); } // // Tags // /** * Retrieve the link to the tag. * * @since 2.3.0 * @see get_term_link() * * @param int|object $tag Tag ID or object. * @return string Link on success, empty string if tag does not exist. */ function get_tag_link( $tag ) { return get_category_link( $tag ); } /** * Retrieve the tags for a post. * * @since 2.3.0 * * @param int $id Post ID. * @return array|false|WP_Error Array of tag objects on success, false on failure. */ function get_the_tags( $id = 0 ) { /** * Filters the array of tags for the given post. * * @since 2.3.0 * * @see get_the_terms() * * @param array $terms An array of tags for the given post. */ return apply_filters( 'get_the_tags', get_the_terms( $id, 'post_tag' ) ); } /** * Retrieve the tags for a post formatted as a string. * * @since 2.3.0 * * @param string $before Optional. Before tags. * @param string $sep Optional. Between tags. * @param string $after Optional. After tags. * @param int $id Optional. Post ID. Defaults to the current post. * @return string|false|WP_Error A list of tags on success, false if there are no terms, WP_Error on failure. */ function get_the_tag_list( $before = '', $sep = '', $after = '', $id = 0 ) { /** * Filters the tags list for a given post. * * @since 2.3.0 * * @param string $tag_list List of tags. * @param string $before String to use before tags. * @param string $sep String to use between the tags. * @param string $after String to use after tags. * @param int $id Post ID. */ return apply_filters( 'the_tags', get_the_term_list( $id, 'post_tag', $before, $sep, $after ), $before, $sep, $after, $id ); } /** * Retrieve the tags for a post. * * @since 2.3.0 * * @param string $before Optional. Before list. * @param string $sep Optional. Separate items using this. * @param string $after Optional. After list. */ function the_tags( $before = null, $sep = ', ', $after = '' ) { if ( null === $before ) $before = __('Tags: '); $the_tags = get_the_tag_list( $before, $sep, $after ); if ( ! is_wp_error( $the_tags ) ) { echo $the_tags; } } /** * Retrieve tag description. * * @since 2.8.0 * * @param int $tag Optional. Tag ID. Will use global tag ID by default. * @return string Tag description, available. */ function tag_description( $tag = 0 ) { return term_description( $tag ); } /** * Retrieve term description. * * @since 2.8.0 * @since 4.9.2 The `$taxonomy` parameter was deprecated. * * @param int $term Optional. Term ID. Will use global term ID by default. * @param null $deprecated Deprecated argument. * @return string Term description, available. */ function term_description( $term = 0, $deprecated = null ) { if ( ! $term && ( is_tax() || is_tag() || is_category() ) ) { $term = get_queried_object(); if ( $term ) { $term = $term->term_id; } } $description = get_term_field( 'description', $term ); return is_wp_error( $description ) ? '' : $description; } /** * Retrieve the terms of the taxonomy that are attached to the post. * * @since 2.5.0 * * @param int|object $post Post ID or object. * @param string $taxonomy Taxonomy name. * @return array|false|WP_Error Array of WP_Term objects on success, false if there are no terms * or the post does not exist, WP_Error on failure. */ function get_the_terms( $post, $taxonomy ) { if ( ! $post = get_post( $post ) ) return false; $terms = get_object_term_cache( $post->ID, $taxonomy ); if ( false === $terms ) { $terms = wp_get_object_terms( $post->ID, $taxonomy ); if ( ! is_wp_error( $terms ) ) { $term_ids = wp_list_pluck( $terms, 'term_id' ); wp_cache_add( $post->ID, $term_ids, $taxonomy . '_relationships' ); } } /** * Filters the list of terms attached to the given post. * * @since 3.1.0 * * @param array|WP_Error $terms List of attached terms, or WP_Error on failure. * @param int $post_id Post ID. * @param string $taxonomy Name of the taxonomy. */ $terms = apply_filters( 'get_the_terms', $terms, $post->ID, $taxonomy ); if ( empty( $terms ) ) return false; return $terms; } /** * Retrieve a post's terms as a list with specified format. * * @since 2.5.0 * * @param int $id Post ID. * @param string $taxonomy Taxonomy name. * @param string $before Optional. Before list. * @param string $sep Optional. Separate items using this. * @param string $after Optional. After list. * @return string|false|WP_Error A list of terms on success, false if there are no terms, WP_Error on failure. */ function get_the_term_list( $id, $taxonomy, $before = '', $sep = '', $after = '' ) { $terms = get_the_terms( $id, $taxonomy ); if ( is_wp_error( $terms ) ) return $terms; if ( empty( $terms ) ) return false; $links = array(); foreach ( $terms as $term ) { $link = get_term_link( $term, $taxonomy ); if ( is_wp_error( $link ) ) { return $link; } $links[] = ''; } /** * Filters the term links for a given taxonomy. * * The dynamic portion of the filter name, `$taxonomy`, refers * to the taxonomy slug. * * @since 2.5.0 * * @param array $links An array of term links. */ $term_links = apply_filters( "term_links-{$taxonomy}", $links ); return $before . join( $sep, $term_links ) . $after; } /** * Retrieve term parents with separator. * * @since 4.8.0 * * @param int $term_id Term ID. * @param string $taxonomy Taxonomy name. * @param string|array $args { * Array of optional arguments. * * @type string $format Use term names or slugs for display. Accepts 'name' or 'slug'. * Default 'name'. * @type string $separator Separator for between the terms. Default '/'. * @type bool $link Whether to format as a link. Default true. * @type bool $inclusive Include the term to get the parents for. Default true. * } * @return string|WP_Error A list of term parents on success, WP_Error or empty string on failure. */ function get_term_parents_list( $term_id, $taxonomy, $args = array() ) { $list = ''; $term = get_term( $term_id, $taxonomy ); if ( is_wp_error( $term ) ) { return $term; } if ( ! $term ) { return $list; } $term_id = $term->term_id; $defaults = array( 'format' => 'name', 'separator' => '/', 'link' => true, 'inclusive' => true, ); $args = wp_parse_args( $args, $defaults ); foreach ( array( 'link', 'inclusive' ) as $bool ) { $args[ $bool ] = wp_validate_boolean( $args[ $bool ] ); } $parents = get_ancestors( $term_id, $taxonomy, 'taxonomy' ); if ( $args['inclusive'] ) { array_unshift( $parents, $term_id ); } foreach ( array_reverse( $parents ) as $term_id ) { $parent = get_term( $term_id, $taxonomy ); $name = ( 'slug' === $args['format'] ) ? $parent->slug : $parent->name; if ( $args['link'] ) { $list .= '' . $name . '' . $args['separator']; } else { $list .= $name . $args['separator']; } } return $list; } /** * Display the terms in a list. * * @since 2.5.0 * * @param int $id Post ID. * @param string $taxonomy Taxonomy name. * @param string $before Optional. Before list. * @param string $sep Optional. Separate items using this. * @param string $after Optional. After list. * @return false|void False on WordPress error. */ function the_terms( $id, $taxonomy, $before = '', $sep = ', ', $after = '' ) { $term_list = get_the_term_list( $id, $taxonomy, $before, $sep, $after ); if ( is_wp_error( $term_list ) ) return false; /** * Filters the list of terms to display. * * @since 2.9.0 * * @param array $term_list List of terms to display. * @param string $taxonomy The taxonomy name. * @param string $before String to use before the terms. * @param string $sep String to use between the terms. * @param string $after String to use after the terms. */ echo apply_filters( 'the_terms', $term_list, $taxonomy, $before, $sep, $after ); } /** * Check if the current post has any of given category. * * @since 3.1.0 * * @param string|int|array $category Optional. The category name/term_id/slug or array of them to check for. * @param int|object $post Optional. Post to check instead of the current post. * @return bool True if the current post has any of the given categories (or any category, if no category specified). */ function has_category( $category = '', $post = null ) { return has_term( $category, 'category', $post ); } /** * Check if the current post has any of given tags. * * The given tags are checked against the post's tags' term_ids, names and slugs. * Tags given as integers will only be checked against the post's tags' term_ids. * If no tags are given, determines if post has any tags. * * Prior to v2.7 of WordPress, tags given as integers would also be checked against the post's tags' names and slugs (in addition to term_ids) * Prior to v2.7, this function could only be used in the WordPress Loop. * As of 2.7, the function can be used anywhere if it is provided a post ID or post object. * * @since 2.6.0 * * @param string|int|array $tag Optional. The tag name/term_id/slug or array of them to check for. * @param int|object $post Optional. Post to check instead of the current post. (since 2.7.0) * @return bool True if the current post has any of the given tags (or any tag, if no tag specified). */ function has_tag( $tag = '', $post = null ) { return has_term( $tag, 'post_tag', $post ); } /** * Check if the current post has any of given terms. * * The given terms are checked against the post's terms' term_ids, names and slugs. * Terms given as integers will only be checked against the post's terms' term_ids. * If no terms are given, determines if post has any terms. * * @since 3.1.0 * * @param string|int|array $term Optional. The term name/term_id/slug or array of them to check for. * @param string $taxonomy Taxonomy name * @param int|object $post Optional. Post to check instead of the current post. * @return bool True if the current post has any of the given tags (or any tag, if no tag specified). */ function has_term( $term = '', $taxonomy = '', $post = null ) { $post = get_post($post); if ( !$post ) return false; $r = is_object_in_term( $post->ID, $taxonomy, $term ); if ( is_wp_error( $r ) ) return false; return $r; }