WordPress/wp-includes/category.php

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<?php
define('TAXONOMY_CATEGORY', 1);
define('TAXONOMY_TAG', 2);
function get_all_category_ids() {
global $wpdb;
if ( ! $cat_ids = wp_cache_get('all_category_ids', 'category') ) {
$cat_ids = get_terms('category', 'get=ids&hierarchical=0&hide_empty=0');
wp_cache_add('all_category_ids', $cat_ids, 'category');
}
return $cat_ids;
}
function &get_categories($args = '') {
// TODO Add back compat fields into each object.
return get_terms('category', $args);
}
// Retrieves category data given a category ID or category object.
// Handles category caching.
function &get_category(&$category, $output = OBJECT) {
return get_term($category, 'category', $output);
}
function get_category_by_path($category_path, $full_match = true, $output = OBJECT) {
global $wpdb;
$category_path = rawurlencode(urldecode($category_path));
$category_path = str_replace('%2F', '/', $category_path);
$category_path = str_replace('%20', ' ', $category_path);
$category_paths = '/' . trim($category_path, '/');
$leaf_path = sanitize_title(basename($category_paths));
$category_paths = explode('/', $category_paths);
$full_path = '';
foreach ( (array) $category_paths as $pathdir )
$full_path .= ( $pathdir != '' ? '/' : '' ) . sanitize_title($pathdir);
$categories = get_terms('category', "slug=$leaf_path");
if ( empty($categories) )
return NULL;
foreach ($categories as $category) {
$path = '/' . $leaf_path;
$curcategory = $category;
while ( ($curcategory->parent != 0) && ($curcategory->parent != $curcategory->term_id) ) {
$curcategory = get_term($curcategory->parent);
$path = '/' . $curcategory->slug . $path;
}
if ( $path == $full_path )
return get_category($category->term_id, $output);
}
// If full matching is not required, return the first cat that matches the leaf.
if ( ! $full_match )
return get_category($categories[0]->term_id, $output);
return NULL;
}
function get_category_by_slug( $slug ) {
return get_term_by('slug', $slug, 'category');
}
// Get the ID of a category from its name
function get_cat_ID($cat_name='General') {
global $wpdb;
$cat = get_term_by('name', $cat_name, 'category');
if ($cat)
return $cat->term_id;
return 0;
}
// Deprecate
function get_catname($cat_ID) {
return get_cat_name($cat_ID);
}
// Get the name of a category from its ID
function get_cat_name($cat_id) {
$cat_id = (int) $cat_id;
$category = &get_category($cat_id);
return $category->cat_name;
}
function cat_is_ancestor_of($cat1, $cat2) {
if ( is_int($cat1) )
$cat1 = & get_category($cat1);
if ( is_int($cat2) )
$cat2 = & get_category($cat2);
if ( !$cat1->term_id || !$cat2->parent )
return false;
if ( $cat2->parent == $cat1->term_id )
return true;
return cat_is_ancestor_of($cat1, get_category($cat2->parent));
}
//
// Private
//
function &_get_cat_children($category_id, $categories) {
if ( empty($categories) )
return array();
$category_list = array();
$has_children = _get_category_hierarchy();
if ( ( 0 != $category_id ) && ! isset($has_children[$category_id]) )
return array();
foreach ( $categories as $category ) {
if ( $category->cat_ID == $category_id )
continue;
if ( $category->category_parent == $category_id ) {
$category_list[] = $category;
if ( !isset($has_children[$category->cat_ID]) )
continue;
if ( $children = _get_cat_children($category->cat_ID, $categories) )
$category_list = array_merge($category_list, $children);
}
}
return $category_list;
}
// Recalculates link or post counts by including items from child categories
// Assumes all relevant children are already in the $categories argument
function _pad_category_counts($type, &$categories) {
global $wpdb;
// Set up some useful arrays
foreach ( $categories as $key => $cat ) {
$cats[$cat->cat_ID] = & $categories[$key];
$cat_IDs[] = $cat->cat_ID;
}
// Get the relevant post2cat or link2cat records and stick them in a lookup table
if ( $type == 'post' ) {
$results = $wpdb->get_results("SELECT post_id, category_id FROM $wpdb->post2cat LEFT JOIN $wpdb->posts ON post_id = ID WHERE category_id IN (".join(',', $cat_IDs).") AND post_type = 'post' AND post_status = 'publish'");
foreach ( $results as $row )
++$cat_items[$row->category_id][$row->post_id];
} else {
$results = $wpdb->get_results("SELECT $wpdb->link2cat.link_id, category_id FROM $wpdb->link2cat LEFT JOIN $wpdb->links USING (link_id) WHERE category_id IN (".join(',', $cat_IDs).") AND link_visible = 'Y'");
foreach ( $results as $row )
++$cat_items[$row->category_id][$row->link_id];
}
// Touch every ancestor's lookup row for each post in each category
foreach ( $cat_IDs as $cat_ID ) {
$child = $cat_ID;
while ( $parent = $cats[$child]->category_parent ) {
if ( !empty($cat_items[$cat_ID]) )
foreach ( $cat_items[$cat_ID] as $item_id => $touches )
++$cat_items[$parent][$item_id];
$child = $parent;
}
}
// Transfer the touched cells
foreach ( (array) $cat_items as $id => $items )
if ( isset($cats[$id]) )
$cats[$id]->{'link' == $type ? 'link_count' : 'category_count'} = count($items);
}
function _get_category_hierarchy() {
$children = get_option('category_children');
if ( is_array($children) )
return $children;
$children = array();
$categories = get_categories('hide_empty=0&hierarchical=0');
foreach ( $categories as $cat ) {
if ( $cat->category_parent > 0 )
$children[$cat->category_parent][] = $cat->cat_ID;
}
update_option('category_children', $children);
return $children;
}
// Tags
function &get_tags($args = '') {
global $wpdb, $category_links;
$key = md5( serialize( $args ) );
if ( $cache = wp_cache_get( 'get_tags', 'category' ) )
if ( isset( $cache[ $key ] ) )
return apply_filters('get_tags', $cache[$key], $args);
$tags = get_terms('post_tag');
if ( empty($tags) )
return array();
$cache[ $key ] = $tags;
wp_cache_set( 'get_tags', $cache, 'category' );
$tags = apply_filters('get_tags', $tags, $args);
return $tags;
}
?>