www.gusucode.com > wordpress PHP博客系统英文版 v4.5.1PHP源码程序 > wordpress PHP博客系统英文版 v4.5.1/wordpress/wordpress/wp-includes/category-template.php
<?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, '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.
*
* 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 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] );
}
/**
* Filter 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 );
}
/**
* 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
*
* @global WP_Rewrite $wp_rewrite
*
* @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 );
}
/**
* Filter 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;
}
}
/**
* 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|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).
* }
* @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' == $args['type'] ) {
/* translators: 1: "type => link", 2: "taxonomy => link_category" alternative */
_deprecated_argument( __FUNCTION__, '3.0',
sprintf( __( '%1$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;
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.
*
* @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 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 $orderby The column to use for ordering categories. Default 'ID'.
* @type string $order Which direction to order categories. Accepts 'ASC' or 'DESC'.
* Default 'ASC'.
* @type bool|int $show_count Whether to show how many posts are in the category. Default 0.
* @type bool|int $hide_empty Whether to hide categories that don't have any posts attached to them.
* Default 1.
* @type bool|int $use_desc_for_title Whether to use the category description as the title attribute.
* Default 1.
* @type string $feed Text to use for the feed link. Default 'Feed for all posts filed
* under [cat name]'.
* @type string $feed_type Feed type. Used to build feed link. See {@link get_term_feed_link()}.
* Default empty string (default feed).
* @type string $feed_image URL of an image to use for the feed link. Default empty string.
* @type int $child_of Term ID to retrieve child terms of. See {@link get_terms()}. Default 0.
* @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 {@link 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 {@link get_terms()}. Default empty string.
* @type bool|int $echo True to echo markup, false to return it. Default 1.
* @type int|array $current_category ID of category, or array of IDs of categories, that should get the
* 'current-cat' class. Default 0.
* @type bool $hierarchical Whether to include terms that have non-empty descendants.
* See {@link get_terms()}. Default true.
* @type string $title_li Text to use for the list title `<li>` element. Pass an empty string
* to disable. Default 'Categories'.
* @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 int $depth Category depth. Used for tab indentation. Default 0.
* @type string $taxonomy Taxonomy name. Default 'category'.
* @type string $separator Separator between links. Default '<br />'.
* }
* @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'] )
$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 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
);
$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
/**
* 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 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.
*
* 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;
// 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 ) {
$title = sprintf( translate_nooped_plural( $translate_nooped_plural, $real_count ), number_format_i18n( $real_count ) );
} else {
$title = call_user_func( $args['topic_count_text_callback'], $real_count, $tag, $args );
}
$tags_data[] = array(
'id' => $tag_id,
'url' => '#' != $tag->link ? $tag->link : '#',
'name' => $tag->name,
'title' => $title,
'slug' => $tag->slug,
'real_count' => $real_count,
'class' => 'tag-link-' . $tag_id,
'font_size' => $args['smallest'] + ( $count - $min_count ) * $font_step,
);
}
/**
* Filter 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[] = "<a href='" . esc_url( $tag_data['url'] ) . "' class='" . esc_attr( $class ) . "' title='" . esc_attr( $tag_data['title'] ) . "' style='font-size: " . esc_attr( str_replace( ',', '.', $tag_data['font_size'] ) . $args['unit'] ) . ";'>" . esc_html( $tag_data['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;
}
/**
* 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 ) {
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|false|WP_Error 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|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 ) {
/**
* 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|false|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 );
if ( ! is_wp_error( $terms ) ) {
$to_cache = array();
foreach ( $terms as $key => $term ) {
$to_cache[ $key ] = $term->data;
}
wp_cache_add( $post->ID, $to_cache, $taxonomy . '_relationships' );
}
}
if ( ! is_wp_error( $terms ) ) {
$terms = array_map( 'get_term', $terms );
}
/**
* 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|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">' . $term->name . '</a>';
}
/**
* Filter the term links for a given taxonomy.
*
* The dynamic portion of the filter name, `$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|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;
/**
* 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;
}