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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 WP_Term[] 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 WP_Term[] $categories An array of categories to return for the post.
* @param int|false $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 WP_Term[] $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 );
}
/**
* Checks 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.
*
* For more information on this and similar theme functions, check out
* the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
* Conditional Tags} article in the Theme Developer Handbook.
*
* @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 );
}
/**
* 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;
}
}
/**
* Displays a tag cloud.
*
* @since 2.3.0
* @since 4.8.0 Added the `show_count` argument.
*
* @param array|string $args {
* Optional. Array or string of arguments for displaying a tag cloud. See wp_generate_tag_cloud()
* and get_terms() for the full lists of arguments that can be passed in `$args`.
*
* @type int $number The number of tags to display. Accepts any positive integer
* or zero to return all. Default 0 (all tags).
* @type string $link Whether to display term editing links or term permalinks.
* Accepts 'edit' and 'view'. Default 'view'.
* @type string $post_type The post type. Used to highlight the proper post type menu
* on the linked edit page. Defaults to the first post type
* associated with the taxonomy.
* @type bool $echo Whether or not to echo the return value. Default true.
* }
* @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 WP_Term[] $tags Array of WP_Term objects to generate the tag cloud for.
* @param string|array $args {
* Optional. Array or 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 WP_Term[] $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 WP_Term[] $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 WP_Term[] $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|WP_Post $post Post ID or object.
* @param string $taxonomy Taxonomy name.
* @return WP_Term[]|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 WP_Term[]|WP_Error $terms Array 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 string[] $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 string $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 );
}
/**
* Checks 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.
*
* For more information on this and similar theme functions, check out
* the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
* Conditional Tags} article in the Theme Developer Handbook.
*
* @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;
}