383 lines
11 KiB
PHP
383 lines
11 KiB
PHP
<?php
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/**
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* WordPress Category API
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*
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* @package WordPress
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*/
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/**
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* Retrieves all category IDs.
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*
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* @since 2.0.0
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* @link http://codex.wordpress.org/Function_Reference/get_all_category_ids
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*
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* @return object List of all of the category IDs.
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*/
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function get_all_category_ids() {
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if ( ! $cat_ids = wp_cache_get('all_category_ids', 'category') ) {
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$cat_ids = get_terms('category', 'fields=ids&get=all');
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wp_cache_add('all_category_ids', $cat_ids, 'category');
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}
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return $cat_ids;
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}
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/**
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* Retrieve list of category objects.
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*
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* If you change the type to 'link' in the arguments, then the link categories
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* will be returned instead. Also all categories will be updated to be backwards
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* compatible with pre-2.3 plugins and themes.
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*
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* @since 2.1.0
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* @see get_terms() Type of arguments that can be changed.
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* @link http://codex.wordpress.org/Function_Reference/get_categories
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*
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* @param string|array $args Optional. Change the defaults retrieving categories.
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* @return array List of categories.
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*/
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function &get_categories($args = '') {
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$defaults = array('type' => 'category');
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$args = wp_parse_args($args, $defaults);
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$taxonomy = 'category';
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if ( 'link' == $args['type'] )
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$taxonomy = 'link_category';
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$categories = get_terms($taxonomy, $args);
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foreach ( array_keys($categories) as $k )
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_make_cat_compat($categories[$k]);
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return $categories;
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}
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/**
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* Retrieves category data given a category ID or category object.
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*
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* If you pass the $category parameter an object, which is assumed to be the
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* category row object retrieved the database. It will cache the category data.
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*
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* If you pass $category an integer of the category ID, then that category will
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* be retrieved from the database, if it isn't already cached, and pass it back.
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*
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* If you look at get_term(), then both types will be passed through several
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* filters and finally sanitized based on the $filter parameter value.
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*
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* The category will converted to maintain backwards compatibility.
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*
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* @since 2.1.0
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* @uses get_term() Used to get the category data from the taxonomy.
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*
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* @param int|object $category Category ID or Category row object
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* @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N
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* @param string $filter Optional. Default is raw or no WordPress defined filter will applied.
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* @return mixed Category data in type defined by $output parameter.
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*/
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function &get_category($category, $output = OBJECT, $filter = 'raw') {
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$category = get_term($category, 'category', $output, $filter);
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if ( is_wp_error( $category ) )
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return $category;
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_make_cat_compat($category);
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return $category;
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}
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/**
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* Retrieve category based on URL containing the category slug.
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*
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* Breaks the $category_path parameter up to get the category slug.
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*
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* Tries to find the child path and will return it. If it doesn't find a
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* match, then it will return the first category matching slug, if $full_match,
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* is set to false. If it does not, then it will return null.
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*
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* It is also possible that it will return a WP_Error object on failure. Check
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* for it when using this function.
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*
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* @since 2.1.0
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*
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* @param string $category_path URL containing category slugs.
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* @param bool $full_match Optional. Whether should match full path or not.
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* @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N
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* @return null|object|array Null on failure. Type is based on $output value.
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*/
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function get_category_by_path($category_path, $full_match = true, $output = OBJECT) {
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$category_path = rawurlencode(urldecode($category_path));
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$category_path = str_replace('%2F', '/', $category_path);
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$category_path = str_replace('%20', ' ', $category_path);
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$category_paths = '/' . trim($category_path, '/');
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$leaf_path = sanitize_title(basename($category_paths));
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$category_paths = explode('/', $category_paths);
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$full_path = '';
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foreach ( (array) $category_paths as $pathdir )
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$full_path .= ( $pathdir != '' ? '/' : '' ) . sanitize_title($pathdir);
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$categories = get_terms('category', "get=all&slug=$leaf_path");
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if ( empty($categories) )
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return null;
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foreach ($categories as $category) {
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$path = '/' . $leaf_path;
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$curcategory = $category;
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while ( ($curcategory->parent != 0) && ($curcategory->parent != $curcategory->term_id) ) {
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$curcategory = get_term($curcategory->parent, 'category');
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if ( is_wp_error( $curcategory ) )
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return $curcategory;
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$path = '/' . $curcategory->slug . $path;
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}
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if ( $path == $full_path )
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return get_category($category->term_id, $output);
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}
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// If full matching is not required, return the first cat that matches the leaf.
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if ( ! $full_match )
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return get_category($categories[0]->term_id, $output);
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return null;
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}
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/**
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* Retrieve category object by category slug.
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*
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* @since 2.3.0
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*
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* @param string $slug The category slug.
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* @return object Category data object
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*/
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function get_category_by_slug( $slug ) {
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$category = get_term_by('slug', $slug, 'category');
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if ( $category )
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_make_cat_compat($category);
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return $category;
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}
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/**
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* Retrieve the ID of a category from its name.
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*
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* @since 1.0.0
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*
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* @param string $cat_name Optional. Default is 'General' and can be any category name.
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* @return int 0, if failure and ID of category on success.
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*/
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function get_cat_ID($cat_name='General') {
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$cat = get_term_by('name', $cat_name, 'category');
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if ($cat)
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return $cat->term_id;
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return 0;
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}
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/**
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* Retrieve the category name by the category ID.
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*
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* @since 0.71
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* @deprecated Use get_cat_name()
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* @see get_cat_name() get_catname() is deprecated in favor of get_cat_name().
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*
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* @param int $cat_ID Category ID
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* @return string category name
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*/
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function get_catname($cat_ID) {
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return get_cat_name($cat_ID);
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}
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/**
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* Retrieve the name of a category from its ID.
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*
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* @since 1.0.0
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*
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* @param int $cat_id Category ID
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* @return string Category name
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*/
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function get_cat_name($cat_id) {
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$cat_id = (int) $cat_id;
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$category = &get_category($cat_id);
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return $category->name;
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}
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/**
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* Check if a category is an ancestor of another category.
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*
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* You can use either an id or the category object for both parameters. If you
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* use an integer the category will be retrieved.
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*
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* @since 2.1.0
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*
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* @param int|object $cat1 ID or object to check if this is the parent category.
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* @param int|object $cat2 The child category.
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* @return bool Whether $cat2 is child of $cat1
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*/
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function cat_is_ancestor_of($cat1, $cat2) {
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if ( is_int($cat1) )
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$cat1 = & get_category($cat1);
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if ( is_int($cat2) )
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$cat2 = & get_category($cat2);
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if ( !$cat1->term_id || !$cat2->parent )
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return false;
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if ( $cat2->parent == $cat1->term_id )
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return true;
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return cat_is_ancestor_of($cat1, get_category($cat2->parent));
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}
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/**
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* Sanitizes category data based on context.
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*
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* @since 2.3.0
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* @uses sanitize_term() See this function for what context are supported.
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*
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* @param object|array $category Category data
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* @param string $context Optional. Default is 'display'.
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* @return object|array Same type as $category with sanitized data for safe use.
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*/
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function sanitize_category($category, $context = 'display') {
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return sanitize_term($category, 'category', $context);
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}
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/**
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* Sanitizes data in single category key field.
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*
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* @since 2.3.0
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* @uses sanitize_term_field() See function for more details.
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*
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* @param string $field Category key to sanitize
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* @param mixed $value Category value to sanitize
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* @param int $cat_id Category ID
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* @param string $context What filter to use, 'raw', 'display', etc.
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* @return mixed Same type as $value after $value has been sanitized.
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*/
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function sanitize_category_field($field, $value, $cat_id, $context) {
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return sanitize_term_field($field, $value, $cat_id, 'category', $context);
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}
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/* Tags */
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/**
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* Retrieves all post tags.
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*
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* @since 2.3.0
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* @see get_terms() For list of arguments to pass.
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* @uses apply_filters() Calls 'get_tags' hook on array of tags and with $args.
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*
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* @param string|array $args Tag arguments to use when retrieving tags.
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* @return array List of tags.
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*/
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function &get_tags($args = '') {
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$tags = get_terms('post_tag', $args);
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if ( empty($tags) )
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return array();
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$tags = apply_filters('get_tags', $tags, $args);
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return $tags;
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}
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/**
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* Retrieve post tag by tag ID or tag object.
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*
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* If you pass the $tag parameter an object, which is assumed to be the tag row
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* object retrieved the database. It will cache the tag data.
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*
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* If you pass $tag an integer of the tag ID, then that tag will
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* be retrieved from the database, if it isn't already cached, and pass it back.
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*
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* If you look at get_term(), then both types will be passed through several
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* filters and finally sanitized based on the $filter parameter value.
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*
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* @since 2.3.0
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*
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* @param int|object $tag
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* @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N
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* @param string $filter Optional. Default is raw or no WordPress defined filter will applied.
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* @return object|array Return type based on $output value.
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*/
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function &get_tag($tag, $output = OBJECT, $filter = 'raw') {
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return get_term($tag, 'post_tag', $output, $filter);
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}
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/* Cache */
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/**
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* Update the categories cache.
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*
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* This function does not appear to be used anymore or does not appear to be
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* needed. It might be a legacy function left over from when there was a need
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* for updating the category cache.
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*
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* @since 1.5.0
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*
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* @return bool Always return True
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*/
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function update_category_cache() {
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return true;
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}
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/**
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* Remove the category cache data based on ID.
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*
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* @since 2.1.0
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* @uses clean_term_cache() Clears the cache for the category based on ID
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*
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* @param int $id Category ID
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*/
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function clean_category_cache($id) {
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clean_term_cache($id, 'category');
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}
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/**
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* Update category structure to old pre 2.3 from new taxonomy structure.
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*
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* This function was added for the taxonomy support to update the new category
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* structure with the old category one. This will maintain compatibility with
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* plugins and themes which depend on the old key or property names.
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*
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* The parameter should only be passed a variable and not create the array or
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* object inline to the parameter. The reason for this is that parameter is
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* passed by reference and PHP will fail unless it has the variable.
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*
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* There is no return value, because everything is updated on the variable you
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* pass to it. This is one of the features with using pass by reference in PHP.
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*
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* @since 2.3.0
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* @access private
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*
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* @param array|object $category Category Row object or array
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*/
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function _make_cat_compat( &$category) {
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if ( is_object($category) ) {
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$category->cat_ID = &$category->term_id;
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$category->category_count = &$category->count;
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$category->category_description = &$category->description;
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$category->cat_name = &$category->name;
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$category->category_nicename = &$category->slug;
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$category->category_parent = &$category->parent;
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} else if ( is_array($category) && isset($category['term_id']) ) {
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$category['cat_ID'] = &$category['term_id'];
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$category['category_count'] = &$category['count'];
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$category['category_description'] = &$category['description'];
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$category['cat_name'] = &$category['name'];
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$category['category_nicename'] = &$category['slug'];
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$category['category_parent'] = &$category['parent'];
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}
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}
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?>
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