template-functions-category.php

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<?php

function get_the_category() {
    global $post, $tablecategories, $tablepost2cat, $wpdb, $category_cache;
    if ($category_cache[$post->ID]) {
        return $category_cache[$post->ID];
    } else {
        $categories = $wpdb->get_results("
            SELECT category_id, cat_name, category_nicename, category_description, category_parent
            FROM  $tablecategories, $tablepost2cat
            WHERE $tablepost2cat.category_id = cat_ID AND $tablepost2cat.post_id = $post->ID
            ");
    
        return $categories;
    }
}

function get_category_link($echo = false, $category_id, $category_nicename) {
    global $wpdb, $tablecategories, $post, $querystring_start, $querystring_equal, $cache_categories;
    $cat_ID = $category_id;
    $permalink_structure = get_settings('permalink_structure');
    
    if ('' == $permalink_structure) {
        $file = get_settings('home') . '/' . get_settings('blogfilename');
        $link = $file.$querystring_start.'cat'.$querystring_equal.$cat_ID;
    } else {
		$category_nicename = $cache_categories[$category_id]->category_nicename;
		// Get any static stuff from the front
        $front = substr($permalink_structure, 0, strpos($permalink_structure, '%'));
		if ( '' == get_settings('category_base') ) :
			$link = get_settings('home') . $front . 'category/';
		else :
         $link = get_settings('home') . get_settings('category_base') . '/';
		endif;
        if ($parent=$cache_categories[$category_id]->category_parent) $link .= get_category_parents($parent, FALSE, '/', TRUE);
        $link .= $category_nicename . '/';
    }

    if ($echo) echo $link;
    return $link;
}

function get_category_rss_link($echo = false, $category_id, $category_nicename) {
       global $querystring_start, $querystring_equal;
       $cat_ID = $category_id;
       $permalink_structure = get_settings('permalink_structure');

       if ('' == $permalink_structure) {
               $file = get_settings('siteurl') . '/wp-rss2.php';
        $link = $file . $querystring_start . 'cat' . $querystring_equal . $category_id;
       } else {
        $link = get_category_link(0, $category_id, $category_nicename);
               $link = $link . "feed/";
       }

       if ($echo) echo $link;
       return $link;
}

function the_category($seperator = '', $parents='') {
    $categories = get_the_category();
    $thelist = '';
    if ('' == $seperator) {
        $thelist .= '<ul class="post-categories">';
        foreach ($categories as $category) {
            $category->cat_name = stripslashes($category->cat_name);
            $thelist .= "\n\t<li>";
            switch(strtolower($parents)) {
                case 'multiple':
                    if ($category->category_parent) {
                        $thelist .= get_category_parents($category->category_parent, TRUE);
                    }
                    $thelist .= '<a href="' . get_category_link(0, $category->category_id, $category->category_nicename) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '">'.$category->cat_name.'</a></li>';
                    break;
                case 'single':
                    $thelist .= '<a href="' . get_category_link(0, $category->category_id, $category->category_nicename) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '>';
                    if ($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(0, $category->category_id, $category->category_nicename) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '">'.$category->cat_name.'</a></li>';
            }
        }
        $thelist .= '</ul>';
    } else {
        $i = 0;
        foreach ($categories as $category) {
            $category->cat_name = stripslashes($category->cat_name);
            if (0 < $i) $thelist .= $seperator . ' ';
            switch(strtolower($parents)) {
                case 'multiple':
                    if ($category->category_parent)    $thelist .= get_category_parents($category->category_parent, TRUE);
                    $thelist .= '<a href="' . get_category_link(0, $category->category_id, $category->category_nicename) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '">'.$category->cat_name.'</a>';
                case 'single':
                    $thelist .= '<a href="' . get_category_link(0, $category->category_id, $category->category_nicename) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '">';
                    if ($category->category_parent)    $thelist .= get_category_parents($category->category_parent, FALSE);
                    $thelist .= "$category->cat_name</a>";
                case '':
                default:
                    $thelist .= '<a href="' . get_category_link(0, $category->category_id, $category->category_nicename) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '">'.$category->cat_name.'</a>';
            }
            ++$i;
        }
    }
    echo apply_filters('the_category', $thelist);
}

function the_category_rss($type = 'rss') {
    $categories = get_the_category();
    $the_list = '';
    foreach ($categories as $category) {
        $category->cat_name = stripslashes(convert_chars($category->cat_name));
        if ('rdf' == $type) {
            $the_list .= "\n\t<dc:subject>$category->cat_name</dc:subject>";
        } else {
            $the_list .= "\n\t<category>$category->cat_name</category>";
        }
    }
    echo apply_filters('the_category_rss', $the_list);
}

function get_the_category_by_ID($cat_ID) {
    global $tablecategories, $cache_categories, $wpdb;
    if ( !$cache_categories[$cat_ID] ) {
        $cat_name = $wpdb->get_var("SELECT cat_name FROM $tablecategories WHERE cat_ID = '$cat_ID'");
        $cache_categories[$cat_ID]->cat_name = $cat_name;
    } else {
        $cat_name = $cache_categories[$cat_ID]->cat_name;
    }
    return(stripslashes($cat_name));
}

function get_category_parents($id, $link = FALSE, $separator = '/', $nicename = FALSE){
    global $tablecategories, $cache_categories;
    $chain = "";
    $parent = $cache_categories[$id];
    if ($nicename) {
        $name = $parent->category_nicename;
    } else {
        $name = $parent->cat_name;
    }
    if ($parent->category_parent) $chain .= get_category_parents($parent->category_parent, $link, $separator, $nicename);
    if ($link) {
        $chain .= '<a href="' . get_category_link(0, $parent->cat_ID, $parent->category_nicename) . '" title="' . sprintf(__("View all posts in %s"), $parent->cat_name) . '">'.$name.'</a>' . $separator;
    } else {
        $chain .= $name.$separator;
    }
    return $chain;
}

function get_category_children($id, $before = '/', $after = '') {
    global $tablecategories, $cache_categories;
    $c_cache = $cache_categories; // Can't do recursive foreach on a global, have to make a copy
    $chain = '';
    foreach ($c_cache as $category){
        if ($category->category_parent == $id){
            $chain .= $before.$category->cat_ID.$after;
            $chain .= get_category_children($category->cat_ID, $before, $after);
        }
    }
    return $chain;
}

function the_category_ID($echo = true) {
    global $post;
    if ($echo)
        echo $post->post_category;
    else
        return $post->post_category;
}

function the_category_head($before='', $after='') {
    global $post, $currentcat, $previouscat, $dateformat, $newday;
    $currentcat = $post->post_category;
    if ($currentcat != $previouscat) {
        echo $before;
        echo get_the_category_by_ID($currentcat);
        echo $after;
        $previouscat = $currentcat;
    }
}

function category_description($category = 0) {
    global $cat, $wpdb, $tablecategories, $cache_categories;
    if (!$category) $category = $cat;
    $category_description = $cache_categories[$category]->category_description;
    $category_description = apply_filters('category_description', $category_description);
    return $category_description;
}

// out of the WordPress loop
function dropdown_cats($optionall = 1, $all = 'All', $sort_column = 'ID', $sort_order = 'asc',
        $optiondates = 0, $optioncount = 0, $hide_empty = 1, $optionnone=FALSE,
        $selected=0, $hide=0) {
    global $tablecategories, $tableposts, $tablepost2cat, $wpdb;
    global $querystring_start, $querystring_equal, $querystring_separator;
    if (($file == 'blah') || ($file == '')) $file = get_settings('home') . '/' . get_settings('blogfilename');
    if (!$selected) $selected=$cat;
    $sort_column = 'cat_'.$sort_column;

    $query = "
        SELECT cat_ID, cat_name, category_nicename,category_parent,
        COUNT($tablepost2cat.post_id) AS cat_count,
        DAYOFMONTH(MAX(post_date)) AS lastday, MONTH(MAX(post_date)) AS lastmonth
        FROM $tablecategories LEFT JOIN $tablepost2cat ON (cat_ID = category_id)
        LEFT JOIN $tableposts ON (ID = post_id)
        WHERE cat_ID > 0
        ";
    if ($hide) {
        $query .= " AND cat_ID != $hide";
        $query .= get_category_children($hide, " AND cat_ID != ");
    }