3 * WordPress Category API
9 * Retrieves all category IDs.
12 * @link http://codex.wordpress.org/Function_Reference/get_all_category_ids
14 * @return object List of all of the category IDs.
16 function get_all_category_ids() {
17 if ( ! $cat_ids = wp_cache_get( 'all_category_ids', 'category' ) ) {
18 $cat_ids = get_terms( 'category', array('fields' => 'ids', 'get' => 'all') );
19 wp_cache_add( 'all_category_ids', $cat_ids, 'category' );
26 * Retrieve list of category objects.
28 * If you change the type to 'link' in the arguments, then the link categories
29 * will be returned instead. Also all categories will be updated to be backwards
30 * compatible with pre-2.3 plugins and themes.
33 * @see get_terms() Type of arguments that can be changed.
34 * @link http://codex.wordpress.org/Function_Reference/get_categories
36 * @param string|array $args Optional. Change the defaults retrieving categories.
37 * @return array List of categories.
39 function get_categories( $args = '' ) {
40 $defaults = array( 'taxonomy' => 'category' );
41 $args = wp_parse_args( $args, $defaults );
43 $taxonomy = apply_filters( 'get_categories_taxonomy', $args['taxonomy'], $args );
46 if ( isset($args['type']) && 'link' == $args['type'] ) {
47 _deprecated_argument( __FUNCTION__, '3.0', '' );
48 $taxonomy = $args['taxonomy'] = 'link_category';
51 $categories = (array) get_terms( $taxonomy, $args );
53 foreach ( array_keys( $categories ) as $k )
54 _make_cat_compat( $categories[$k] );
60 * Retrieves category data given a category ID or category object.
62 * If you pass the $category parameter an object, which is assumed to be the
63 * category row object retrieved the database. It will cache the category data.
65 * If you pass $category an integer of the category ID, then that category will
66 * be retrieved from the database, if it isn't already cached, and pass it back.
68 * If you look at get_term(), then both types will be passed through several
69 * filters and finally sanitized based on the $filter parameter value.
71 * The category will converted to maintain backwards compatibility.
74 * @uses get_term() Used to get the category data from the taxonomy.
76 * @param int|object $category Category ID or Category row object
77 * @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N
78 * @param string $filter Optional. Default is raw or no WordPress defined filter will applied.
79 * @return mixed Category data in type defined by $output parameter.
81 function get_category( $category, $output = OBJECT, $filter = 'raw' ) {
82 $category = get_term( $category, 'category', $output, $filter );
83 if ( is_wp_error( $category ) )
86 _make_cat_compat( $category );
92 * Retrieve category based on URL containing the category slug.
94 * Breaks the $category_path parameter up to get the category slug.
96 * Tries to find the child path and will return it. If it doesn't find a
97 * match, then it will return the first category matching slug, if $full_match,
98 * is set to false. If it does not, then it will return null.
100 * It is also possible that it will return a WP_Error object on failure. Check
101 * for it when using this function.
105 * @param string $category_path URL containing category slugs.
106 * @param bool $full_match Optional. Whether full path should be matched.
107 * @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N
108 * @return null|object|array Null on failure. Type is based on $output value.
110 function get_category_by_path( $category_path, $full_match = true, $output = OBJECT ) {
111 $category_path = rawurlencode( urldecode( $category_path ) );
112 $category_path = str_replace( '%2F', '/', $category_path );
113 $category_path = str_replace( '%20', ' ', $category_path );
114 $category_paths = '/' . trim( $category_path, '/' );
115 $leaf_path = sanitize_title( basename( $category_paths ) );
116 $category_paths = explode( '/', $category_paths );
118 foreach ( (array) $category_paths as $pathdir )
119 $full_path .= ( $pathdir != '' ? '/' : '' ) . sanitize_title( $pathdir );
121 $categories = get_terms( 'category', array('get' => 'all', 'slug' => $leaf_path) );
123 if ( empty( $categories ) )
126 foreach ( $categories as $category ) {
127 $path = '/' . $leaf_path;
128 $curcategory = $category;
129 while ( ( $curcategory->parent != 0 ) && ( $curcategory->parent != $curcategory->term_id ) ) {
130 $curcategory = get_term( $curcategory->parent, 'category' );
131 if ( is_wp_error( $curcategory ) )
133 $path = '/' . $curcategory->slug . $path;
136 if ( $path == $full_path )
137 return get_category( $category->term_id, $output );
140 // If full matching is not required, return the first cat that matches the leaf.
142 return get_category( $categories[0]->term_id, $output );
148 * Retrieve category object by category slug.
152 * @param string $slug The category slug.
153 * @return object Category data object
155 function get_category_by_slug( $slug ) {
156 $category = get_term_by( 'slug', $slug, 'category' );
158 _make_cat_compat( $category );
164 * Retrieve the ID of a category from its name.
168 * @param string $cat_name Category name.
169 * @return int 0, if failure and ID of category on success.
171 function get_cat_ID( $cat_name ) {
172 $cat = get_term_by( 'name', $cat_name, 'category' );
174 return $cat->term_id;
179 * Retrieve the name of a category from its ID.
183 * @param int $cat_id Category ID
184 * @return string Category name, or an empty string if category doesn't exist.
186 function get_cat_name( $cat_id ) {
187 $cat_id = (int) $cat_id;
188 $category = get_category( $cat_id );
189 if ( ! $category || is_wp_error( $category ) )
191 return $category->name;
195 * Check if a category is an ancestor of another category.
197 * You can use either an id or the category object for both parameters. If you
198 * use an integer the category will be retrieved.
202 * @param int|object $cat1 ID or object to check if this is the parent category.
203 * @param int|object $cat2 The child category.
204 * @return bool Whether $cat2 is child of $cat1
206 function cat_is_ancestor_of( $cat1, $cat2 ) {
207 return term_is_ancestor_of( $cat1, $cat2, 'category' );
211 * Sanitizes category data based on context.
214 * @uses sanitize_term() See this function for what context are supported.
216 * @param object|array $category Category data
217 * @param string $context Optional. Default is 'display'.
218 * @return object|array Same type as $category with sanitized data for safe use.
220 function sanitize_category( $category, $context = 'display' ) {
221 return sanitize_term( $category, 'category', $context );
225 * Sanitizes data in single category key field.
228 * @uses sanitize_term_field() See function for more details.
230 * @param string $field Category key to sanitize
231 * @param mixed $value Category value to sanitize
232 * @param int $cat_id Category ID
233 * @param string $context What filter to use, 'raw', 'display', etc.
234 * @return mixed Same type as $value after $value has been sanitized.
236 function sanitize_category_field( $field, $value, $cat_id, $context ) {
237 return sanitize_term_field( $field, $value, $cat_id, 'category', $context );
243 * Retrieves all post tags.
246 * @see get_terms() For list of arguments to pass.
247 * @uses apply_filters() Calls 'get_tags' hook on array of tags and with $args.
249 * @param string|array $args Tag arguments to use when retrieving tags.
250 * @return array List of tags.
252 function get_tags( $args = '' ) {
253 $tags = get_terms( 'post_tag', $args );
255 if ( empty( $tags ) ) {
260 $tags = apply_filters( 'get_tags', $tags, $args );
265 * Retrieve post tag by tag ID or tag object.
267 * If you pass the $tag parameter an object, which is assumed to be the tag row
268 * object retrieved the database. It will cache the tag data.
270 * If you pass $tag an integer of the tag ID, then that tag will
271 * be retrieved from the database, if it isn't already cached, and pass it back.
273 * If you look at get_term(), then both types will be passed through several
274 * filters and finally sanitized based on the $filter parameter value.
278 * @param int|object $tag
279 * @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N
280 * @param string $filter Optional. Default is raw or no WordPress defined filter will applied.
281 * @return object|array Return type based on $output value.
283 function get_tag( $tag, $output = OBJECT, $filter = 'raw' ) {
284 return get_term( $tag, 'post_tag', $output, $filter );
290 * Remove the category cache data based on ID.
293 * @uses clean_term_cache() Clears the cache for the category based on ID
295 * @param int $id Category ID
297 function clean_category_cache( $id ) {
298 clean_term_cache( $id, 'category' );
302 * Update category structure to old pre 2.3 from new taxonomy structure.
304 * This function was added for the taxonomy support to update the new category
305 * structure with the old category one. This will maintain compatibility with
306 * plugins and themes which depend on the old key or property names.
308 * The parameter should only be passed a variable and not create the array or
309 * object inline to the parameter. The reason for this is that parameter is
310 * passed by reference and PHP will fail unless it has the variable.
312 * There is no return value, because everything is updated on the variable you
313 * pass to it. This is one of the features with using pass by reference in PHP.
318 * @param array|object $category Category Row object or array
320 function _make_cat_compat( &$category ) {
321 if ( is_object( $category ) ) {
322 $category->cat_ID = &$category->term_id;
323 $category->category_count = &$category->count;
324 $category->category_description = &$category->description;
325 $category->cat_name = &$category->name;
326 $category->category_nicename = &$category->slug;
327 $category->category_parent = &$category->parent;
328 } elseif ( is_array( $category ) && isset( $category['term_id'] ) ) {
329 $category['cat_ID'] = &$category['term_id'];
330 $category['category_count'] = &$category['count'];
331 $category['category_description'] = &$category['description'];
332 $category['cat_name'] = &$category['name'];
333 $category['category_nicename'] = &$category['slug'];
334 $category['category_parent'] = &$category['parent'];