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<?php
/**
* Category Template Tags and API.
*
* @package WordPress
* @subpackage Template
*/
/**
* 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, 'category' );
if ( is_wp_error( $category ) )
return '';
return $category;
}
/**
* Retrieve category parents with separator.
*
* @since 1.2.0
*
* @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 $visited Optional. Already linked to categories to prevent duplicates.
* @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, $visited = array() ) {
$chain = '';
$parent = get_term( $id, 'category' );
if ( is_wp_error( $parent ) )
return $parent;
if ( $nicename )
$name = $parent->slug;
else
$name = $parent->name;
if ( $parent->parent && ( $parent->parent != $parent->term_id ) && !in_array( $parent->parent, $visited ) ) {
$visited[] = $parent->parent;
$chain .= get_category_parents( $parent->parent, $link, $separator, $nicename, $visited );
}
if ( $link )
$chain .= '<a href="' . esc_url( get_category_link( $parent->term_id ) ) . '">'.$name.'</a>' . $separator;
else
$chain .= $name.$separator;
return $chain;
}
/**
* Retrieve post categories.
*
* @since 0.71
*
* @param int $id Optional, default to current post ID. The post ID.
* @return array
*/
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] );
}
/**
* Filter the array of categories to return for a post.
*
* @since 3.1.0
*
* @param array $categories An array of categories to return for the post.
*/
return apply_filters( 'get_the_categories', $categories );
}
/**
* Sort categories by name.
*
* Used by usort() as a callback, should not be used directly. Can actually be
* used to sort any term object.
*
* @since 2.3.0
* @access private
*
* @param object $a
* @param object $b
* @return int
*/
function _usort_terms_by_name( $a, $b ) {
return strcmp( $a->name, $b->name );
}
/**
* Sort categories by ID.
*
* Used by usort() as a callback, should not be used directly. Can actually be
* used to sort any term object.
*
* @since 2.3.0
* @access private
*
* @param object $a
* @param object $b
* @return int
*/
function _usort_terms_by_ID( $a, $b ) {
if ( $a->term_id > $b->term_id )
return 1;
elseif ( $a->term_id < $b->term_id )
return -1;
else
return 0;
}
/**
* 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, 'category' );
if ( is_wp_error( $category ) )
return $category;
return ( $category ) ? $category->name : '';
}
/**
* Retrieve category list in either HTML list or custom format.
*
* @since 1.5.1
*
* @param string $separator Optional, default is empty string. Separator for between the categories.
* @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 );
}
$categories = get_the_category( $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;
}
}
/**
* Filter the category or list of categories.
*
* @since 1.2.0
*
* @param array $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 in 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 the category list for the post.
*
* @since 0.71
*
* @param string $separator Optional, default is empty string. Separator for between the categories.
* @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.
*
* @param string|array $args {
* Optional. Array or string of arguments to generate a categories drop-down element.
*
* @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 string $order Whether to order terms in ascending or descending order. Accepts 'ASC'
* or 'DESC'. Default 'ASC'.
* @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 $hide_empty Whether to hide categories that don't have any posts. Accepts 0, 1, or
* their bool equivalents. Default 1.
* @type int $child_of Term ID to retrieve child terms of. See get_terms(). Default 0.
* @type array|string $exclude Array or comma/space-separated string of term ids to exclude.
* If `$include` is non-empty, `$exclude` is ignored. Default empty array.
* @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 $taxonomy Name of the category 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).
* }
* @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',
);
$defaults['selected'] = ( is_category() ) ? get_query_var( 'cat' ) : 0;
// Back compat.
if ( isset( $args['type'] ) && 'link' == $args['type'] ) {
_deprecated_argument( __FUNCTION__, '3.0', '' );
$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;
if ( ! $r['hide_if_empty'] || ! empty( $categories ) ) {
$output = "<select name='$name' id='$id' class='$class' $tab_index_attribute>\n";
} else {
$output = '';
}
if ( empty( $categories ) && ! $r['hide_if_empty'] && ! empty( $r['show_option_none'] ) ) {
/**
* Filter 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 Taxonomy element to list.
*/
$show_option_none = apply_filters( 'list_cats', $r['show_option_none'] );
$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'] );
$selected = ( '0' === strval($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'] );
$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";
}
/**
* Filter 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.
*
* The list of arguments is below:
* 'show_option_all' (string) - Text to display for showing all categories.
* 'orderby' (string) default is 'ID' - What column to use for ordering the
* categories.
* 'order' (string) default is 'ASC' - What direction to order categories.
* 'show_count' (bool|int) default is 0 - Whether to show how many posts are
* in the category.
* 'hide_empty' (bool|int) default is 1 - Whether to hide categories that
* don't have any posts attached to them.
* 'use_desc_for_title' (bool|int) default is 1 - Whether to use the
* category description as the title attribute.
* 'feed' - See {@link get_categories()}.
* 'feed_type' - See {@link get_categories()}.
* 'feed_image' - See {@link get_categories()}.
* 'child_of' (int) default is 0 - See {@link get_categories()}.
* 'exclude' (string) - See {@link get_categories()}.
* 'exclude_tree' (string) - See {@link get_categories()}.
* 'echo' (bool|int) default is 1 - Whether to display or retrieve content.
* 'current_category' (int) - See {@link get_categories()}.
* 'hierarchical' (bool) - See {@link get_categories()}.
* 'title_li' (string) - See {@link get_categories()}.
* 'depth' (int) - The max depth.
*
* @since 2.1.0
*
* @param string|array $args Optional. Override default arguments.
* @return false|null|string HTML content only if 'echo' argument is 0.
*/
function wp_list_categories( $args = '' ) {
$defaults = array(
'show_option_all' => '', 'show_option_none' => __('No categories'),
'orderby' => 'name', 'order' => 'ASC',
'style' => 'list',
'show_count' => 0, 'hide_empty' => 1,
'use_desc_for_title' => 1, 'child_of' => 0,
'feed' => '', 'feed_type' => '',
'feed_image' => '', 'exclude' => '',
'exclude_tree' => '', 'current_category' => 0,
'hierarchical' => true, 'title_li' => __( 'Categories' ),
'echo' => 1, 'depth' => 0,
'taxonomy' => 'category'
);
$r = wp_parse_args( $args, $defaults );
if ( !isset( $r['pad_counts'] ) && $r['show_count'] && $r['hierarchical'] )
$r['pad_counts'] = true;
if ( true == $r['hierarchical'] ) {
$r['exclude_tree'] = $r['exclude'];
$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'] ) {
$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 = ( 'page' == get_option( 'show_on_front' ) && get_option( 'page_for_posts' ) ) ? get_permalink( get_option( 'page_for_posts' ) ) : 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'] )
$output .= '</ul></li>';
/**
* Filter 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 tooltip of the tag link.
*
* The 'topic_count_text_callback' argument is a function, which given the count
* of the posts with that tag returns a text for the tooltip of the tag link.
*
* 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 {@link 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
*
* @param array|string|null $args Optional. Override default arguments.
* @return null|false Generated tag cloud, only if no failures and 'array' is set for the 'format' argument.
*/
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
);
$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 false;
$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
/**
* Filter 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
*
* @param integer $count number of posts with that tag
* @return integer scaled count
*/
function default_topic_count_scale( $count ) {
return round(log10($count + 1) * 100);
}
/**
* Generates a tag cloud (heatmap) from provided data.
*
* 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 'tag_cloud_sort' filter allows you to override the sorting.
* Passed to the filter: $tags array and $args array, has to return the $tags array
* after sorting it.
*
* 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' or
* 'RAND'.
*
* The 'number' argument is how many tags to return. By default, the limit will
* be to return the entire tag cloud list.
*
* The 'topic_count_text' argument is a nooped plural from _n_noop() to generate the
* text for the tooltip of the tag link.
*
* The 'topic_count_text_callback' argument is a function, which given the count
* of the posts with that tag returns a text for the tooltip of the tag link.
*
* @todo Complete functionality.
* @since 2.3.0
*
* @param array $tags List of tags.
* @param string|array $args Optional, override default arguments.
* @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,
);
$args = wp_parse_args( $args, $defaults );
$return = ( 'array' === $args['format'] ) ? array() : '';
if ( empty( $tags ) ) {
return $return;
}
// Juggle topic count tooltips:
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 topic', '%s topics' );
} 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 topic', '%s topics' );
}
/**
* Filter 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;
$a = array();
foreach ( $tags as $key => $tag ) {
$count = $counts[ $key ];
$real_count = $real_counts[ $key ];
$tag_link = '#' != $tag->link ? esc_url( $tag->link ) : '#';
$tag_id = isset($tags[ $key ]->id) ? $tags[ $key ]->id : $key;
$tag_name = $tags[ $key ]->name;
if ( $translate_nooped_plural ) {
$title_attribute = sprintf( translate_nooped_plural( $translate_nooped_plural, $real_count ), number_format_i18n( $real_count ) );
} else {
$title_attribute = call_user_func( $args['topic_count_text_callback'], $real_count, $tag, $args );
}
$a[] = "<a href='$tag_link' class='tag-link-$tag_id' title='" . esc_attr( $title_attribute ) . "' style='font-size: " .
str_replace( ',', '.', ( $args['smallest'] + ( ( $count - $min_count ) * $font_step ) ) )
. $args['unit'] . ";'>$tag_name</a>";
}
switch ( $args['format'] ) {
case 'array' :
$return =& $a;
break;
case 'list' :
$return = "<ul class='wp-tag-cloud'>\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'] ) {
/**
* Filter 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;
}
/**
* Callback for comparing objects based on name
*
* @since 3.1.0
* @access private
*/
function _wp_object_name_sort_cb( $a, $b ) {
return strnatcasecmp( $a->name, $b->name );
}
/**
* Callback for comparing objects based on count
*
* @since 3.1.0
* @access private
*/
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.
*/
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.
*/
function walk_category_dropdown_tree() {
$args = func_get_args();
// the user's options are the third parameter
if ( empty($args[2]['walker']) || !is_a($args[2]['walker'], 'Walker') )
$walker = new Walker_CategoryDropdown;
else
$walker = $args[2]['walker'];
return call_user_func_array(array( &$walker, 'walk' ), $args );
}
/**
* Create HTML list of categories.
*
* @package WordPress
* @since 2.1.0
* @uses Walker
*/
class Walker_Category extends Walker {
/**
* What the class handles.
*
* @see Walker::$tree_type
* @since 2.1.0
* @var string
*/
public $tree_type = 'category';
/**
* Database fields to use.
*
* @see Walker::$db_fields
* @since 2.1.0
* @todo Decouple this
* @var array
*/
public $db_fields = array ('parent' => 'parent', 'id' => 'term_id');
/**
* Starts the list before the elements are added.
*
* @see Walker::start_lvl()
*
* @since 2.1.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of category. Used for tab indentation.
* @param array $args An array of arguments. Will only append content if style argument value is 'list'.
* @see wp_list_categories()
*/
public function start_lvl( &$output, $depth = 0, $args = array() ) {
if ( 'list' != $args['style'] )
return;
$indent = str_repeat("\t", $depth);
$output .= "$indent<ul class='children'>\n";
}
/**
* Ends the list of after the elements are added.
*
* @see Walker::end_lvl()
*
* @since 2.1.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of category. Used for tab indentation.
* @param array $args An array of arguments. Will only append content if style argument value is 'list'.
* @wsee wp_list_categories()
*/
public function end_lvl( &$output, $depth = 0, $args = array() ) {
if ( 'list' != $args['style'] )
return;
$indent = str_repeat("\t", $depth);
$output .= "$indent</ul>\n";
}
/**
* Start the element output.
*
* @see Walker::start_el()
*
* @since 2.1.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $category Category data object.
* @param int $depth Depth of category in reference to parents. Default 0.
* @param array $args An array of arguments. @see wp_list_categories()
* @param int $id ID of the current category.
*/
public function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) {
/** This filter is documented in wp-includes/category-template.php */
$cat_name = apply_filters(
'list_cats',
esc_attr( $category->name ),
$category
);
// Don't generate an element if the category name is empty.
if ( ! $cat_name ) {
return;
}
$link = '<a href="' . esc_url( get_term_link( $category ) ) . '" ';
if ( $args['use_desc_for_title'] && ! empty( $category->description ) ) {
/**
* Filter the category description for display.
*
* @since 1.2.0
*
* @param string $description Category description.
* @param object $category Category object.
*/
$link .= 'title="' . esc_attr( strip_tags( apply_filters( 'category_description', $category->description, $category ) ) ) . '"';
}
$link .= '>';
$link .= $cat_name . '</a>';
if ( ! empty( $args['feed_image'] ) || ! empty( $args['feed'] ) ) {
$link .= ' ';
if ( empty( $args['feed_image'] ) ) {
$link .= '(';
}
$link .= '<a href="' . esc_url( get_term_feed_link( $category->term_id, $category->taxonomy, $args['feed_type'] ) ) . '"';
if ( empty( $args['feed'] ) ) {
$alt = ' alt="' . sprintf(__( 'Feed for all posts filed under %s' ), $cat_name ) . '"';
} else {
$alt = ' alt="' . $args['feed'] . '"';
$name = $args['feed'];
$link .= empty( $args['title'] ) ? '' : $args['title'];
}
$link .= '>';
if ( empty( $args['feed_image'] ) ) {
$link .= $name;
} else {
$link .= "<img src='" . $args['feed_image'] . "'$alt" . ' />';
}
$link .= '</a>';
if ( empty( $args['feed_image'] ) ) {
$link .= ')';
}
}
if ( ! empty( $args['show_count'] ) ) {
$link .= ' (' . number_format_i18n( $category->count ) . ')';
}
if ( 'list' == $args['style'] ) {
$output .= "\t<li";
$css_classes = array(
'cat-item',
'cat-item-' . $category->term_id,
);
if ( ! empty( $args['current_category'] ) ) {
$_current_category = get_term( $args['current_category'], $category->taxonomy );
if ( $category->term_id == $args['current_category'] ) {
$css_classes[] = 'current-cat';
} elseif ( $category->term_id == $_current_category->parent ) {
$css_classes[] = 'current-cat-parent';
}
}
/**
* Filter the list of CSS classes to include with each category in the list.
*
* @since 4.2.0
*
* @see wp_list_categories()
*
* @param array $css_classes An array of CSS classes to be applied to each list item.
* @param object $category Category data object.
* @param int $depth Depth of page, used for padding.
* @param array $args An array of wp_list_categories() arguments.
*/
$css_classes = implode( ' ', apply_filters( 'category_css_class', $css_classes, $category, $depth, $args ) );
$output .= ' class="' . $css_classes . '"';
$output .= ">$link\n";
} else {
$output .= "\t$link<br />\n";
}
}
/**
* Ends the element output, if needed.
*
* @see Walker::end_el()
*
* @since 2.1.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $page Not used.
* @param int $depth Depth of category. Not used.
* @param array $args An array of arguments. Only uses 'list' for whether should append to output. @see wp_list_categories()
*/
public function end_el( &$output, $page, $depth = 0, $args = array() ) {
if ( 'list' != $args['style'] )
return;
$output .= "</li>\n";
}
}
/**
* Create HTML dropdown list of Categories.
*
* @package WordPress
* @since 2.1.0
* @uses Walker
*/
class Walker_CategoryDropdown extends Walker {
/**
* @see Walker::$tree_type
* @since 2.1.0
* @var string
*/
public $tree_type = 'category';
/**
* @see Walker::$db_fields
* @since 2.1.0
* @todo Decouple this
* @var array
*/
public $db_fields = array ('parent' => 'parent', 'id' => 'term_id');
/**
* Start the element output.
*
* @see Walker::start_el()
* @since 2.1.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $category Category data object.
* @param int $depth Depth of category. Used for padding.
* @param array $args Uses 'selected', 'show_count', and 'value_field' keys, if they exist.
* See {@see wp_dropdown_categories()}.
*/
public function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) {
$pad = str_repeat(' ', $depth * 3);
/** This filter is documented in wp-includes/category-template.php */
$cat_name = apply_filters( 'list_cats', $category->name, $category );
if ( ! isset( $args['value_field'] ) || ! isset( $category->{$args['value_field']} ) ) {
$args['value_field'] = 'term_id';
}
$output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $category->{$args['value_field']} ) . "\"";
if ( $category->term_id == $args['selected'] )
$output .= ' selected="selected"';
$output .= '>';
$output .= $pad.$cat_name;
if ( $args['show_count'] )
$output .= ' ('. number_format_i18n( $category->count ) .')';
$output .= "</option>\n";
}
}
//
// 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 ) {
if ( ! is_object( $tag ) )
$tag = (int) $tag;
$tag = get_term_link( $tag, 'post_tag' );
if ( is_wp_error( $tag ) )
return '';
return $tag;
}
/**
* Retrieve the tags for a post.
*
* @since 2.3.0
*
* @param int $id Post ID.
* @return array|bool Array of tag objects on success, false on failure.
*/
function get_the_tags( $id = 0 ) {
/**
* Filter 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|bool|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 ) {
/**
* Filter 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 )
$before = __('Tags: ');
echo get_the_tag_list($before, $sep, $after);
}
/**
* 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
*
* @param int $term Optional. Term ID. Will use global term ID by default.
* @param string $taxonomy Optional taxonomy name. Defaults to 'post_tag'.
* @return string Term description, available.
*/
function term_description( $term = 0, $taxonomy = 'post_tag' ) {
if ( ! $term && ( is_tax() || is_tag() || is_category() ) ) {
$term = get_queried_object();
if ( $term ) {
$taxonomy = $term->taxonomy;
$term = $term->term_id;
}
}
$description = get_term_field( 'description', $term, $taxonomy );
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|bool|WP_Error Array of 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, $taxonomy );
wp_cache_add($post->ID, $terms, $taxonomy . '_relationships');
}
/**
* Filter 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|bool|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">' . $term->name . '</a>';
}
/**
* Filter the term links for a given taxonomy.
*
* The dynamic portion of the filter name, `$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;
}
/**
* 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|null False on WordPress error. Returns null when displaying.
*/
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;
/**
* Filter 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;
}
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