<?php
function get_category_children($id, $before = '/', $after = '') {
if ( 0 == $id )
return '';
$chain = '';
$cat_ids = get_all_category_ids();
foreach ( $cat_ids as $cat_id ) {
if ( $cat_id == $id)
continue;
$category = get_category($cat_id);
if ( $category->category_parent == $id ) {
$chain .= $before.$category->cat_ID.$after;
$chain .= get_category_children($category->cat_ID, $before, $after);
}
}
return $chain;
}
function get_category_link($category_id) {
global $wp_rewrite;
$catlink = $wp_rewrite->get_category_permastruct();
if ( empty($catlink) ) {
$file = get_option('home') . '/';
$catlink = $file . '?cat=' . $category_id;
} else {
$category = &get_category($category_id);
$category_nicename = $category->category_nicename;
if ( $parent = $category->category_parent )
$category_nicename = get_category_parents($parent, false, '/', true) . $category_nicename;
$catlink = str_replace('%category%', $category_nicename, $catlink);
$catlink = get_option('home') . user_trailingslashit($catlink, 'category');
}
return apply_filters('category_link', $catlink, $category_id);
}
function get_category_parents($id, $link = FALSE, $separator = '/', $nicename = FALSE){
$chain = '';
$parent = &get_category($id);
if ( $nicename )
$name = $parent->category_nicename;
else
$name = $parent->cat_name;
if ( $parent->category_parent && ($parent->category_parent != $parent->cat_ID) )
$chain .= get_category_parents($parent->category_parent, $link, $separator, $nicename);
if ( $link )
$chain .= '<a href="' . get_category_link($parent->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $parent->cat_name) . '">'.$name.'</a>' . $separator;
else
$chain .= $name.$separator;
return $chain;
}
function get_the_category($id = false) {
global $post, $category_cache, $blog_id;
$id = (int) $id;
if ( !$id )
$id = (int) $post->ID;
if ( !isset($category_cache[$blog_id][$id]) )
update_post_category_cache($id);
$categories = $category_cache[$blog_id][$id];
if ( !empty($categories) )
usort($categories, '_get_the_category_usort');
else
$categories = array();
return $categories;
}
function _get_the_category_usort($a, $b) {
return strcmp($a->category_name, $b->category_name);
}
function _get_the_category_usort_by_ID($a, $b) {
if ( $a->cat_ID > $b->cat_ID )
return 1;
elseif ( $a->cat_ID < $b->cat_ID )
return -1;
else
return 0;
}
function get_the_category_by_ID($cat_ID) {
$cat_ID = (int) $cat_ID;
$category = &get_category($cat_ID);
return $category->cat_name;
}
function get_the_category_list($separator = '', $parents='') {
global $wp_rewrite;
$categories = get_the_category();
if (empty($categories))
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->category_parent)
$thelist .= get_category_parents($category->category_parent, TRUE);
$thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" ' . $rel . '>' . $category->cat_name.'</a></li>';
break;
case 'single':
$thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" ' . $rel . '>';
if ($category->category_parent)
$thelist .= get_category_parents($category->category_parent, FALSE);
$thelist .= $category->cat_name.'</a></li>';
break;
case '':
default:
$thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" ' . $rel . '>' . $category->cat_name.'</a></li>';
}
}
$thelist .= '</ul>';
} else {
$i = 0;
foreach ( $categories as $category ) {
if ( 0 < $i )
$thelist .= $separator . ' ';
switch ( strtolower($parents) ) {
case 'multiple':
if ( $category->category_parent )
$thelist .= get_category_parents($category->category_parent, TRUE);
$thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" ' . $rel . '>' . $category->cat_name.'</a>';
break;
case 'single':
$thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" ' . $rel . '>';
if ( $category->category_parent )
$thelist .= get_category_parents($category->category_parent, FALSE);
$thelist .= "$category->cat_name</a>";
break;
case '':
default:
$thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" ' . $rel . '>' . $category->cat_name.'</a>';
}
++$i;
}
}
return apply_filters('the_category', $thelist, $separator, $parents);
}
function in_category($category) { // Check if the current post is in the given category
global $category_cache, $post, $blog_id;
if ( isset( $category_cache[$blog_id][$post->ID][$category] ) )
return true;
else
return false;
}
function the_category($separator = '', $parents='') {
echo get_the_category_list($separator, $parents);
}
function category_description($category = 0) {
global $cat;
if ( !$category )
$category = $cat;
$category = & get_category($category);
return apply_filters('category_description', $category->category_description, $category->cat_ID);
}
function wp_dropdown_categories($args = '') {
if ( is_array($args) )
$r = &$args;
else
parse_str($args, $r);
$defaults = array('show_option_all' => '', 'show_option_none' => '', 'orderby' => 'ID',
'order' => 'ASC', 'show_last_update' => 0, 'show_count' => 0,
'hide_empty' => 1, 'child_of' => 0, 'exclude' => '', 'echo' => 1,
'selected' => 0, 'hierarchical' => 0, 'name' => 'cat',
'class' => 'postform');
$defaults['selected'] = ( is_category() ) ? get_query_var('cat') : 0;
$r = array_merge($defaults, $r);
$r['include_last_update_time'] = $r['show_last_update'];
extract($r, EXTR_SKIP);
$categories = get_categories($r);
$output = '';
if ( ! empty($categories) ) {
$output = "<select name='$name' id='$name' class='$class'>\n";
if ( $show_option_all ) {
$show_option_all = apply_filters('list_cats', $show_option_all);
$output .= "\t<option value='0'>$show_option_all</option>\n";
}
if ( $show_option_none) {
$show_option_none = apply_filters('list_cats', $show_option_none);
$output .= "\t<option value='-1'>$show_option_none</option>\n";
}
if ( $hierarchical )
$depth = 0; // Walk the full depth.
else
$depth = -1; // Flat.
$output .= walk_category_dropdown_tree($categories, $depth, $r);
$output .= "</select>\n";
}
$output = apply_filters('wp_dropdown_cats', $output);
if ( $echo )
echo $output;
return $output;
}
function wp_list_categories($args = '') {
if ( is_array($args) )
$r = &$args;
else
parse_str($args, $r);
$defaults = array('show_option_all' => '', 'orderby' => 'name',
'order' => 'ASC', 'show_last_update' => 0, 'style' => 'list',
'show_count' => 0, 'hide_empty' => 1, 'use_desc_for_title' => 1,
'child_of' => 0, 'feed' => '', 'feed_image' => '', 'exclude' => '',
'hierarchical' => true, 'title_li' => __('Categories'));
$r = array_merge($defaults, $r);
if ( !isset($r['pad_counts']) && $r['show_count'] && $r['hierarchical'] )
$r['pad_counts'] = true;
if ( isset($r['show_date']) )
$r['include_last_update_time'] = $r['show_date'];
extract($r, EXTR_SKIP);
$categories = get_categories($r);
$output = '';
if ( $title_li && 'list' == $style )
$output = '<li class="categories">' . $r['title_li'] . '<ul>';
if ( empty($categories) ) {
if ( 'list' == $style )
$output .= '<li>' . __("No categories") . '</li>';
else
$output .= __("No categories");
} else {
global $wp_query;
if( !empty($show_option_all) )
if ('list' == $style )
$output .= '<li><a href="' . get_bloginfo('url') . '">' . $show_option_all . '</a></li>';
else
$output .= '<a href="' . get_bloginfo('url') . '">' . $show_option_all . '</a>';
if ( is_category() )
$r['current_category'] = $wp_query->get_queried_object_id();
if ( $hierarchical )
$depth = 0; // Walk the full depth.
else
$depth = -1; // Flat.
$output .= walk_category_tree($categories, $depth, $r);
}
if ( $title_li && 'list' == $style )
$output .= '</ul></li>';
echo apply_filters('wp_list_categories', $output);
}
//
// Helper functions
//
function walk_category_tree() {
$walker = new Walker_Category;
$args = func_get_args();
return call_user_func_array(array(&$walker, 'walk'), $args);
}
function walk_category_dropdown_tree() {
$walker = new Walker_CategoryDropdown;
$args = func_get_args();
return call_user_func_array(array(&$walker, 'walk'), $args);
}
?>