1<?php
  2/**
  3 * Taxonomy API: Core category-specific functionality
  4 *
  5 * @package WordPress
  6 * @subpackage Taxonomy
  7 */
  8
  9/**
 10 * Retrieves a list of category objects.
 11 *
 12 * If you set the 'taxonomy' argument to 'link_category', the link categories
 13 * will be returned instead.
 14 *
 15 * @since 2.1.0
 16 *
 17 * @see get_terms() Type of arguments that can be changed.
 18 *
 19 * @param string|array $args {
 20 *     Optional. Arguments to retrieve categories. See get_terms() for additional options.
 21 *
 22 *     @type string $taxonomy Taxonomy to retrieve terms for. Default 'category'.
 23 * }
 24 * @return array List of category objects.
 25 */
 26function get_categories( $args = '' ) {
 27	$defaults = array( 'taxonomy' => 'category' );
 28	$args     = wp_parse_args( $args, $defaults );
 29
 30	/**
 31	 * Filters the taxonomy used to retrieve terms when calling get_categories().
 32	 *
 33	 * @since 2.7.0
 34	 *
 35	 * @param string $taxonomy Taxonomy to retrieve terms from.
 36	 * @param array  $args     An array of arguments. See get_terms().
 37	 */
 38	$args['taxonomy'] = apply_filters( 'get_categories_taxonomy', $args['taxonomy'], $args );
 39
 40	// Back compat.
 41	if ( isset( $args['type'] ) && 'link' === $args['type'] ) {
 42		_deprecated_argument(
 43			__FUNCTION__,
 44			'3.0.0',
 45			sprintf(
 46				/* translators: 1: "type => link", 2: "taxonomy => link_category" */
 47				__( '%1$s is deprecated. Use %2$s instead.' ),
 48				'<code>type => link</code>',
 49				'<code>taxonomy => link_category</code>'
 50			)
 51		);
 52		$args['taxonomy'] = 'link_category';
 53	}
 54
 55	$categories = get_terms( $args );
 56
 57	if ( is_wp_error( $categories ) ) {
 58		$categories = array();
 59	} else {
 60		$categories = (array) $categories;
 61		foreach ( array_keys( $categories ) as $k ) {
 62			_make_cat_compat( $categories[ $k ] );
 63		}
 64	}
 65
 66	return $categories;
 67}
 68
 69/**
 70 * Retrieves category data given a category ID or category object.
 71 *
 72 * If you pass the $category parameter an object, which is assumed to be the
 73 * category row object retrieved the database. It will cache the category data.
 74 *
 75 * If you pass $category an integer of the category ID, then that category will
 76 * be retrieved from the database, if it isn't already cached, and pass it back.
 77 *
 78 * If you look at get_term(), then both types will be passed through several
 79 * filters and finally sanitized based on the $filter parameter value.
 80 *
 81 * @since 1.5.1
 82 *
 83 * @param int|object $category Category ID or category row object.
 84 * @param string     $output   Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
 85 *                             correspond to a WP_Term object, an associative array, or a numeric array,
 86 *                             respectively. Default OBJECT.
 87 * @param string     $filter   Optional. How to sanitize category fields. Default 'raw'.
 88 * @return WP_Term|array|WP_Error|null Category data in type defined by $output parameter.
 89 *                                     Returns a WP_Term object with backwards compatible property aliases filled in.
 90 *                                     WP_Error if $category is empty, null if it does not exist.
 91 */
 92function get_category( $category, $output = OBJECT, $filter = 'raw' ) {
 93	$category = get_term( $category, 'category', $output, $filter );
 94
 95	if ( is_wp_error( $category ) ) {
 96		return $category;
 97	}
 98
 99	_make_cat_compat( $category );
100
101	return $category;
102}
103
104/**
105 * Retrieves a category based on URL containing the category slug.
106 *
107 * Breaks the $category_path parameter up to get the category slug.
108 *
109 * Tries to find the child path and will return it. If it doesn't find a
110 * match, then it will return the first category matching slug, if $full_match,
111 * is set to false. If it does not, then it will return null.
112 *
113 * It is also possible that it will return a WP_Error object on failure. Check
114 * for it when using this function.
115 *
116 * @since 2.1.0
117 *
118 * @param string $category_path URL containing category slugs.
119 * @param bool   $full_match    Optional. Whether full path should be matched.
120 * @param string $output        Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
121 *                              correspond to a WP_Term object, an associative array, or a numeric array,
122 *                              respectively. Default OBJECT.
123 * @return WP_Term|array|WP_Error|null Type is based on $output value.
124 */
125function get_category_by_path( $category_path, $full_match = true, $output = OBJECT ) {
126	$category_path  = rawurlencode( urldecode( $category_path ) );
127	$category_path  = str_replace( '%2F', '/', $category_path );
128	$category_path  = str_replace( '%20', ' ', $category_path );
129	$category_paths = '/' . trim( $category_path, '/' );
130	$leaf_path      = sanitize_title( basename( $category_paths ) );
131	$category_paths = explode( '/', $category_paths );
132	$full_path      = '';
133
134	foreach ( (array) $category_paths as $pathdir ) {
135		$full_path .= ( '' !== $pathdir ? '/' : '' ) . sanitize_title( $pathdir );
136	}
137
138	$categories = get_terms(
139		array(
140			'taxonomy' => 'category',
141			'get'      => 'all',
142			'slug'     => $leaf_path,
143		)
144	);
145
146	if ( empty( $categories ) ) {
147		return;
148	}
149
150	foreach ( $categories as $category ) {
151		$path        = '/' . $leaf_path;
152		$curcategory = $category;
153
154		while ( ( 0 !== $curcategory->parent ) && ( $curcategory->parent !== $curcategory->term_id ) ) {
155			$curcategory = get_term( $curcategory->parent, 'category' );
156
157			if ( is_wp_error( $curcategory ) ) {
158				return $curcategory;
159			}
160
161			$path = '/' . $curcategory->slug . $path;
162		}
163
164		if ( $path === $full_path ) {
165			$category = get_term( $category->term_id, 'category', $output );
166			_make_cat_compat( $category );
167
168			return $category;
169		}
170	}
171
172	// If full matching is not required, return the first cat that matches the leaf.
173	if ( ! $full_match ) {
174		$category = get_term( reset( $categories )->term_id, 'category', $output );
175		_make_cat_compat( $category );
176
177		return $category;
178	}
179}
180
181/**
182 * Retrieves a category object by category slug.
183 *
184 * @since 2.3.0
185 *
186 * @param string $slug The category slug.
187 * @return object|false Category data object on success, false if not found.
188 */
189function get_category_by_slug( $slug ) {
190	$category = get_term_by( 'slug', $slug, 'category' );
191
192	if ( $category ) {
193		_make_cat_compat( $category );
194	}
195
196	return $category;
197}
198
199/**
200 * Retrieves the ID of a category from its name.
201 *
202 * @since 1.0.0
203 *
204 * @param string $cat_name Category name.
205 * @return int Category ID on success, 0 if the category doesn't exist.
206 */
207function get_cat_ID( $cat_name ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
208	$cat = get_term_by( 'name', $cat_name, 'category' );
209
210	if ( $cat ) {
211		return $cat->term_id;
212	}
213
214	return 0;
215}
216
217/**
218 * Retrieves the name of a category from its ID.
219 *
220 * @since 1.0.0
221 *
222 * @param int $cat_id Category ID.
223 * @return string Category name, or an empty string if the category doesn't exist.
224 */
225function get_cat_name( $cat_id ) {
226	$cat_id   = (int) $cat_id;
227	$category = get_term( $cat_id, 'category' );
228
229	if ( ! $category || is_wp_error( $category ) ) {
230		return '';
231	}
232
233	return $category->name;
234}
235
236/**
237 * Checks if a category is an ancestor of another category.
238 *
239 * You can use either an ID or the category object for both parameters.
240 * If you use an integer, the category will be retrieved.
241 *
242 * @since 2.1.0
243 *
244 * @param int|object $cat1 ID or object to check if this is the parent category.
245 * @param int|object $cat2 The child category.
246 * @return bool Whether $cat2 is child of $cat1.
247 */
248function cat_is_ancestor_of( $cat1, $cat2 ) {
249	return term_is_ancestor_of( $cat1, $cat2, 'category' );
250}
251
252/**
253 * Sanitizes category data based on context.
254 *
255 * @since 2.3.0
256 *
257 * @param object|array $category Category data.
258 * @param string       $context  Optional. Default 'display'.
259 * @return object|array Same type as $category with sanitized data for safe use.
260 */
261function sanitize_category( $category, $context = 'display' ) {
262	return sanitize_term( $category, 'category', $context );
263}
264
265/**
266 * Sanitizes data in single category key field.
267 *
268 * @since 2.3.0
269 *
270 * @param string $field   Category key to sanitize.
271 * @param mixed  $value   Category value to sanitize.
272 * @param int    $cat_id  Category ID.
273 * @param string $context What filter to use, 'raw', 'display', etc.
274 * @return mixed Value after $value has been sanitized.
275 */
276function sanitize_category_field( $field, $value, $cat_id, $context ) {
277	return sanitize_term_field( $field, $value, $cat_id, 'category', $context );
278}
279
280/* Tags */
281
282/**
283 * Retrieves all post tags.
284 *
285 * @since 2.3.0
286 *
287 * @param string|array $args {
288 *     Optional. Arguments to retrieve tags. See get_terms() for additional options.
289 *
290 *     @type string $taxonomy Taxonomy to retrieve terms for. Default 'post_tag'.
291 * }
292 * @return WP_Term[]|int|WP_Error Array of 'post_tag' term objects, a count thereof,
293 *                                or WP_Error if any of the taxonomies do not exist.
294 */
295function get_tags( $args = '' ) {
296	$defaults = array( 'taxonomy' => 'post_tag' );
297	$args     = wp_parse_args( $args, $defaults );
298
299	$tags = get_terms( $args );
300
301	if ( empty( $tags ) ) {
302		$tags = array();
303	} else {
304		/**
305		 * Filters the array of term objects returned for the 'post_tag' taxonomy.
306		 *
307		 * @since 2.3.0
308		 *
309		 * @param WP_Term[]|int|WP_Error $tags Array of 'post_tag' term objects, a count thereof,
310		 *                                     or WP_Error if any of the taxonomies do not exist.
311		 * @param array                  $args An array of arguments. See {@see get_terms()}.
312		 */
313		$tags = apply_filters( 'get_tags', $tags, $args );
314	}
315
316	return $tags;
317}
318
319/**
320 * Retrieves a post tag by tag ID or tag object.
321 *
322 * If you pass the $tag parameter an object, which is assumed to be the tag row
323 * object retrieved from the database, it will cache the tag data.
324 *
325 * If you pass $tag an integer of the tag ID, then that tag will be retrieved
326 * from the database, if it isn't already cached, and passed back.
327 *
328 * If you look at get_term(), both types will be passed through several filters
329 * and finally sanitized based on the $filter parameter value.
330 *
331 * @since 2.3.0
332 *
333 * @param int|WP_Term|object $tag    A tag ID or object.
334 * @param string             $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
335 *                                   correspond to a WP_Term object, an associative array, or a numeric array,
336 *                                   respectively. Default OBJECT.
337 * @param string             $filter Optional. How to sanitize tag fields. Default 'raw'.
338 * @return WP_Term|array|WP_Error|null Tag data in type defined by $output parameter.
339 *                                     WP_Error if $tag is empty, null if it does not exist.
340 */
341function get_tag( $tag, $output = OBJECT, $filter = 'raw' ) {
342	return get_term( $tag, 'post_tag', $output, $filter );
343}
344
345/* Cache */
346
347/**
348 * Removes the category cache data based on ID.
349 *
350 * @since 2.1.0
351 *
352 * @param int $id Category ID
353 */
354function clean_category_cache( $id ) {
355	clean_term_cache( $id, 'category' );
356}
357
358/**
359 * Updates category structure to old pre-2.3 from new taxonomy structure.
360 *
361 * This function was added for the taxonomy support to update the new category
362 * structure with the old category one. This will maintain compatibility with
363 * plugins and themes which depend on the old key or property names.
364 *
365 * The parameter should only be passed a variable and not create the array or
366 * object inline to the parameter. The reason for this is that parameter is
367 * passed by reference and PHP will fail unless it has the variable.
368 *
369 * There is no return value, because everything is updated on the variable you
370 * pass to it. This is one of the features with using pass by reference in PHP.
371 *
372 * @since 2.3.0
373 * @since 4.4.0 The `$category` parameter now also accepts a WP_Term object.
374 * @access private
375 *
376 * @param array|object|WP_Term $category Category row object or array.
377 */
378function _make_cat_compat( &$category ) {
379	if ( is_object( $category ) && ! is_wp_error( $category ) ) {
380		$category->cat_ID               = $category->term_id;
381		$category->category_count       = $category->count;
382		$category->category_description = $category->description;
383		$category->cat_name             = $category->name;
384		$category->category_nicename    = $category->slug;
385		$category->category_parent      = $category->parent;
386	} elseif ( is_array( $category ) && isset( $category['term_id'] ) ) {
387		$category['cat_ID']               = &$category['term_id'];
388		$category['category_count']       = &$category['count'];
389		$category['category_description'] = &$category['description'];
390		$category['cat_name']             = &$category['name'];
391		$category['category_nicename']    = &$category['slug'];
392		$category['category_parent']      = &$category['parent'];
393	}
394}
395