wp-includes/category-template.php

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<?php
/**
 * Taxonomy API: Core category-specific template tags
 *
 * @package WordPress
 * @subpackage Template
 * @since 1.2.0
 */

/**
 * Retrieve category link URL.
 *
 * @since 1.0.0
 * @see get_term_link()
 *
 * @param int|object $category Category ID or object.
 * @return string Link on success, empty string if category does not exist.
 */
function get_category_link( $category ) {
        if ( ! is_object( $category ) )
                $category = (int) $category;

        $category = get_term_link( $category );

        if ( is_wp_error( $category ) )
                return '';

        return $category;
}

/**
 * Retrieve category parents with separator.
 *
 * @since 1.2.0
 * @since 4.8.0 The `$visited` parameter was deprecated and renamed to `$deprecated`.
 *
 * @param int $id Category ID.
 * @param bool $link Optional, default is false. Whether to format with link.
 * @param string $separator Optional, default is '/'. How to separate categories.
 * @param bool $nicename Optional, default is false. Whether to use nice name for display.
 * @param array $deprecated Not used.
 * @return string|WP_Error A list of category parents on success, WP_Error on failure.
 */
function get_category_parents( $id, $link = false, $separator = '/', $nicename = false, $deprecated = array() ) {

        if ( ! empty( $deprecated ) ) {
                _deprecated_argument( __FUNCTION__, '4.8.0' );
        }

        $format = $nicename ? 'slug' : 'name';

        $args = array(
                'separator' => $separator,
                'link'      => $link,
                'format'    => $format,
        );

        return get_term_parents_list( $id, 'category', $args );
}

/**
 * Retrieve post categories.
 *
 * This tag may be used outside The Loop by passing a post id as the parameter.
 *
 * Note: This function only returns results from the default "category" taxonomy.
 * For custom taxonomies use get_the_terms().
 *
 * @since 0.71
 *
 * @param int $id Optional, default to current post ID. The post ID.
 * @return array Array of WP_Term objects, one for each category assigned to the post.
 */
function get_the_category( $id = false ) {
        $categories = get_the_terms( $id, 'category' );
        if ( ! $categories || is_wp_error( $categories ) )
                $categories = array();

        $categories = array_values( $categories );

        foreach ( array_keys( $categories ) as $key ) {
                _make_cat_compat( $categories[$key] );
        }

        /**
         * Filters the array of categories to return for a post.
         *
         * @since 3.1.0
         * @since 4.4.0 Added `$id` parameter.
         *
         * @param array $categories An array of categories to return for the post.
         * @param int   $id         ID of the post.
         */
        return apply_filters( 'get_the_categories', $categories, $id );
}

/**
 * Retrieve category name based on category ID.
 *
 * @since 0.71
 *
 * @param int $cat_ID Category ID.
 * @return string|WP_Error Category name on success, WP_Error on failure.
 */
function get_the_category_by_ID( $cat_ID ) {
        $cat_ID = (int) $cat_ID;
        $category = get_term( $cat_ID );

        if ( is_wp_error( $category ) )
                return $category;

        return ( $category ) ? $category->name : '';
}

/**
 * Retrieve category list for a post in either HTML list or custom format.
 *
 * @since 1.5.1
 *
 * @global WP_Rewrite $wp_rewrite
 *
 * @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.
 * @return string
 */
function get_the_category_list( $separator = '', $parents = '', $post_id = false ) {
        global $wp_rewrite;
        if ( ! is_object_in_taxonomy( get_post_type( $post_id ), 'category' ) ) {
                /** This filter is documented in wp-includes/category-template.php */
                return apply_filters( 'the_category', '', $separator, $parents );
        }

        /**
         * Filters the categories before building the category list.
         *
         * @since 4.4.0
         *
         * @param array    $categories An array of the post's categories.
         * @param int|bool $post_id    ID of the post we're retrieving categories for. When `false`, we assume the
         *                             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 .= '<ul class="post-categories">';
                foreach ( $categories as $category ) {
                        $thelist .= "\n\t<li>";
                        switch ( strtolower( $parents ) ) {
                                case 'multiple':
                                        if ( $category->parent )
                                                $thelist .= get_category_parents( $category->parent, true, $separator );
                                        $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name.'</a></li>';
                                        break;
                                case 'single':
                                        $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '"  ' . $rel . '>';
                                        if ( $category->parent )
                                                $thelist .= get_category_parents( $category->parent, false, $separator );
                                        $thelist .= $category->name.'</a></li>';
                                        break;
                                case '':
                                default:
                                        $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name.'</a></li>';
                        }
                }
                $thelist .= '</ul>';
        } 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 .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name.'</a>';
                                        break;
                                case 'single':
                                        $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>';
                                        if ( $category->parent )
                                                $thelist .= get_category_parents( $category->parent, false, $separator );
                                        $thelist .= "$category->name</a>";
                                        break;
                                case '':
                                default:
                                        $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name.'</a>';
                        }
                        ++$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 `<select>` element should have the HTML5 'required' attribute.
 *                                           Default false.
 * }
 * @return string HTML content only if 'echo' argument is 0.
 */
function wp_dropdown_categories( $args = '' ) {
        $defaults = array(
                'show_option_all'   => '',
                'show_option_none'  => '',
                'orderby'           => 'id',
                'order'             => 'ASC',
                'show_count'        => 0,
                'hide_empty'        => 1,
                'child_of'          => 0,
                'exclude'           => '',
                'echo'              => 1,
                'selected'          => 0,
                'hierarchical'      => 0,
                'name'              => 'cat',
                'id'                => '',
                'class'             => 'postform',
                'depth'             => 0,
                'tab_index'         => 0,
                'taxonomy'          => 'category',
                'hide_if_empty'     => false,
                'option_none_value' => -1,
                'value_field'       => 'term_id',
                'required'          => false,
        );

        $defaults['selected'] = ( is_category() ) ? get_query_var( 'cat' ) : 0;

        // Back compat.
        if ( isset( $args['type'] ) && 'link' == $args['type'] ) {
                _deprecated_argument( __FUNCTION__, '3.0.0',
                        /* translators: 1: "type => link", 2: "taxonomy => link_category" */
                        sprintf( __( '%1$s is deprecated. Use %2$s instead.' ),
                                '<code>type => link</code>',
                                '<code>taxonomy => link_category</code>'
                        )
                );
                $args['taxonomy'] = 'link_category';
        }

        $r = wp_parse_args( $args, $defaults );
        $option_none_value = $r['option_none_value'];

        if ( ! isset( $r['pad_counts'] ) && $r['show_count'] && $r['hierarchical'] ) {
                $r['pad_counts'] = true;
        }

        $tab_index = $r['tab_index'];

        $tab_index_attribute = '';
        if ( (int) $tab_index > 0 ) {
                $tab_index_attribute = " tabindex=\"$tab_index\"";
        }

        // Avoid clashes with the 'name' param of get_terms().
        $get_terms_args = $r;
        unset( $get_terms_args['name'] );
        $categories = get_terms( $r['taxonomy'], $get_terms_args );

        $name = esc_attr( $r['name'] );
        $class = esc_attr( $r['class'] );
        $id = $r['id'] ? esc_attr( $r['id'] ) : $name;
        $required = $r['required'] ? 'required' : '';

        if ( ! $r['hide_if_empty'] || ! empty( $categories ) ) {
                $output = "<select $required name='$name' id='$id' class='$class' $tab_index_attribute>\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<option value='" . esc_attr( $option_none_value ) . "' selected='selected'>$show_option_none</option>\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'" : '';
                        $output .= "\t<option value='0'$selected>$show_option_all</option>\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<option value='" . esc_attr( $option_none_value ) . "'$selected>$show_option_none</option>\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 .= "</select>\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 '<br />'.
 *     @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 `<br>` tags. Default 'list'.
 *     @type string       $taxonomy              Taxonomy name. Default 'category'.
 *     @type string       $title_li              Text to use for the list title `<li>` 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'           => '<br />',
                '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 = '<li class="' . esc_attr( $r['class'] ) . '">' . $r['title_li'] . '<ul>';
        }
        if ( empty( $categories ) ) {
                if ( ! empty( $show_option_none ) ) {
                        if ( 'list' == $r['style'] ) {
                                $output .= '<li class="cat-item-none">' . $show_option_none . '</li>';
                        } else {
                                $output .= $show_option_none;
                        }
                }
        } else {
                if ( ! empty( $show_option_all ) ) {

                        $posts_page = '';

                        // For taxonomies that belong only to custom post types, point to a valid archive.
                        $taxonomy_object = get_taxonomy( $r['taxonomy'] );
                        if ( ! in_array( 'post', $taxonomy_object->object_type ) && ! in_array( 'page', $taxonomy_object->object_type ) ) {
                                foreach ( $taxonomy_object->object_type as $object_type ) {
                                        $_object_type = get_post_type_object( $object_type );

                                        // Grab the first one.
                                        if ( ! empty( $_object_type->has_archive ) ) {
                                                $posts_page = get_post_type_archive_link( $object_type );
                                                break;
                                        }
                                }
                        }

                        // Fallback for the 'All' link is the posts page.
                        if ( ! $posts_page ) {
                                if ( 'page' == get_option( 'show_on_front' ) && get_option( 'page_for_posts' ) ) {
                                        $posts_page = get_permalink( get_option( 'page_for_posts' ) );
                                } else {
                                        $posts_page = home_url( '/' );
                                }
                        }

                        $posts_page = esc_url( $posts_page );
                        if ( 'list' == $r['style'] ) {
                                $output .= "<li class='cat-item-all'><a href='$posts_page'>$show_option_all</a></li>";
                        } else {
                                $output .= "<a href='$posts_page'>$show_option_all</a>";
                        }
                }

                if ( empty( $r['current_category'] ) && ( is_category() || is_tax() || is_tag() ) ) {
                        $current_term_object = get_queried_object();
                        if ( $current_term_object && $r['taxonomy'] === $current_term_object->taxonomy ) {
                                $r['current_category'] = get_queried_object_id();
                        }
                }

                if ( $r['hierarchical'] ) {
                        $depth = $r['depth'];
                } else {
                        $depth = -1; // Flat.
                }
                $output .= walk_category_tree( $categories, $depth, $r );
        }

        if ( $r['title_li'] && 'list' == $r['style'] && ( ! empty( $categories ) || ! $r['hide_title_if_empty'] ) ) {
                $output .= '</ul></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'] ? '<span class="tag-link-count"> (' . $real_count . ')</span>' : '',
                );
        }

        /**
         * 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 );
                $a[] = sprintf(
                        '<a href="%1$s"%2$s class="%3$s" style="font-size: %4$s;"%5$s>%6$s%7$s</a>',
                        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 = "<ul class='wp-tag-cloud' role='list'>\n\t<li>";
                        $return .= join( "</li>\n\t<li>", $a );
                        $return .= "</li>\n</ul>\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[] = '<a href="' . esc_url( $link ) . '" rel="tag">' . $term->name . '</a>';
        }

        /**
         * 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 .= '<a href="' . esc_url( get_term_link( $parent->term_id, $taxonomy ) ) . '">' . $name . '</a>' . $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;
}