template-functions-category.php

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    $query .=" GROUP BY cat_ID";
    if (intval($hide_empty) == 1) $query .= " HAVING cat_count > 0";
    $query .= " ORDER BY $sort_column $sort_order, post_date DESC";

    $categories = $wpdb->get_results($query);
    echo "<select name='cat' class='postform'>\n";
    if (intval($optionall) == 1) {
        $all = apply_filters('list_cats', $all);
        echo "\t<option value='all'>$all</option>\n";
    }
    if (intval($optionnone) == 1) echo "\t<option value='0'>None</option>\n";
    if ($categories) {
        foreach ($categories as $category) {
            $cat_name = apply_filters('list_cats', $category->cat_name);
            echo "\t<option value=\"".$category->cat_ID."\"";
            if ($category->cat_ID == $selected)
                echo ' selected="selected"';
            echo '>';
            echo stripslashes($cat_name);
            if (intval($optioncount) == 1) echo '&nbsp;&nbsp;('.$category->cat_count.')';
            if (intval($optiondates) == 1) echo '&nbsp;&nbsp;'.$category->lastday.'/'.$category->lastmonth;
            echo "</option>\n";
        }
    }
    echo "</select>\n";
}

// out of the WordPress loop
function wp_list_cats($args = '') {
	parse_str($args, $r);
	if (!isset($r['optionall'])) $r['optionall'] = 0;
    if (!isset($r['all'])) $r['all'] = 'All';
	if (!isset($r['sort_column'])) $r['sort_column'] = 'ID';
	if (!isset($r['sort_order'])) $r['sort_order'] = 'asc';
	if (!isset($r['file'])) $r['file'] = '';
	if (!isset($r['list'])) $r['list'] = true;
	if (!isset($r['optiondates'])) $r['optiondates'] = 0;
	if (!isset($r['optioncount'])) $r['optioncount'] = 0;
	if (!isset($r['hide_empty'])) $r['hide_empty'] = 1;
	if (!isset($r['use_desc_for_title'])) $r['use_desc_for_title'] = 1;
	if (!isset($r['children'])) $r['children'] = true;
	if (!isset($r['child_of'])) $r['child_of'] = 0;
	if (!isset($r['categories'])) $r['categories'] = 0;
	if (!isset($r['recurse'])) $r['recurse'] = 0;
	if (!isset($r['feed'])) $r['feed'] = '';
	if (!isset($r['feed_image'])) $r['feed_image'] = '';
	if (!isset($r['exclude'])) $r['exclude'] = '';

	list_cats($r['optionall'], $r['all'], $r['sort_column'], $r['sort_order'], $r['file'],	$r['list'], $r['optiondates'], $r['optioncount'], $r['hide_empty'], $r['use_desc_for_title'], $r['children'], $r['child_of'], $r['categories'], $r['recurse'], $r['feed'], $r['feed_image'], $r['exclude']);
}

function list_cats($optionall = 1, $all = 'All', $sort_column = 'ID', $sort_order = 'asc', $file = '', $list = true, $optiondates = 0, $optioncount = 0, $hide_empty = 1, $use_desc_for_title = 1, $children=FALSE, $child_of=0, $categories=0, $recurse=0, $feed = '', $feed_image = '', $exclude = '') {
	global $tablecategories, $tableposts, $tablepost2cat, $wpdb, $category_posts;
	global $querystring_start, $querystring_equal, $querystring_separator;
	// Optiondates now works
	if ('' == $file) {
		$file = get_settings('home') . '/' . get_settings('blogfilename');
	}

	$exclusions = '';
	if (!empty($exclude)) {
		$excats = preg_split('/[\s,]+/',$exclude);
		if (count($excats)) {
			foreach ($excats as $excat) {
				$exclusions .= ' AND cat_ID <> ' . intval($excat) . ' ';
			}
		}
	}

	if (intval($categories)==0){
		$sort_column = 'cat_'.$sort_column;

		$query  = "
			SELECT cat_ID, cat_name, category_nicename, category_description, category_parent
			FROM $tablecategories
			WHERE cat_ID > 0 $exclusions
			ORDER BY $sort_column $sort_order";

		$categories = $wpdb->get_results($query);
	}
	if (!count($category_posts)) {
		$cat_counts = $wpdb->get_results("	SELECT cat_ID,
		COUNT($tablepost2cat.post_id) AS cat_count
		FROM $tablecategories 
		INNER JOIN $tablepost2cat ON (cat_ID = category_id)
		INNER JOIN $tableposts ON (ID = post_id)
		WHERE post_status = 'publish' $exclusions
		GROUP BY category_id");
		foreach ($cat_counts as $cat_count) {
			if (1 != intval($hide_empty) || $cat_count > 0) {
				$category_posts["$cat_count->cat_ID"] = $cat_count->cat_count;
			}
		}
	}
	
	if (intval($optiondates) == 1) {
		$cat_dates = $wpdb->get_results("	SELECT cat_ID,
		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 post_status = 'publish' $exclusions
		GROUP BY category_id");
		foreach ($cat_dates as $cat_date) {
			$category_lastday["$cat_date->cat_ID"] = $cat_date->lastday;
			$category_lastmonth["$cat_date->cat_ID"] = $cat_date->lastmonth;
		}
	}
	
	if (intval($optionall) == 1 && !$child_of && $categories) {
		$all = apply_filters('list_cats', $all);
		$link = "<a href=\"".$file.$querystring_start.'cat'.$querystring_equal.'all">'.$all."</a>";
		if ($list) {
			echo "\n\t<li>$link</li>";
		} else {
			echo "\t$link<br />\n";
		}
	}
	
	$num_found=0;
	$thelist = "";
	
	foreach ($categories as $category) {
		if ((intval($hide_empty) == 0 || isset($category_posts["$category->cat_ID"])) && (!$children || $category->category_parent == $child_of)) {
			$num_found++;
			$link = '<a href="'.get_category_link(0, $category->cat_ID, $category->category_nicename).'" ';
			if ($use_desc_for_title == 0 || empty($category->category_description)) {
				$link .= 'title="'. sprintf(__("View all posts filed under %s"), htmlspecialchars($category->cat_name)) . '"';
			} else {
				$link .= 'title="' . htmlspecialchars($category->category_description) . '"';
			}
			$link .= '>';
			$link .= stripslashes($category->cat_name).'</a>';

			if ( (! empty($feed_image)) || (! empty($feed)) ) {
				
				$link .= ' ';

				if (empty($feed_image)) {
					$link .= '(';
				}

				$link .= '<a href="' . get_category_rss_link(0, $category->cat_ID, $category->category_nicename)  . '"';

				if ( !empty($feed) ) {
					$title =  ' title="' . stripslashes($feed) . '"';
					$alt = ' alt="' . stripslashes($feed) . '"';
					$name = stripslashes($feed);
					$link .= $title;
				}

				$link .= '>';

				if (! empty($feed_image)) {
					$link .= "<img src=\"$feed_image\" border=\"0\"$alt$title" . ' />';
				} else {
					$link .= $name;
				}
				
				$link .= '</a>';

				if (empty($feed_image)) {
					$link .= ')';
				}
			}

			if (intval($optioncount) == 1) {
				$link .= ' ('.intval($category_posts["$category->cat_ID"]).')';
			}
			if (intval($optiondates) == 1) {
				$link .= ' '.$category_lastday["$category->cat_ID"].'/'.$category_lastmonth["$category->cat_ID"];
			}
			if ($list) {
				$thelist .= "\t<li>$link\n";
			} else {
				$thelist .= "\t$link<br />\n";
			}
			if ($children) $thelist .= list_cats($optionall, $all, $sort_column, $sort_order, $file, $list, $optiondates, $optioncount, $hide_empty, $use_desc_for_title, $children, $category->cat_ID, $categories, 1, $feed, $feed_image, $exclude);
			if ($list) $thelist .= "</li>\n";
			}
	}
	if (!$num_found && !$child_of){
		if ($list) {
			$before = '<li>';
			$after = '</li>';
		}
		echo $before . __("No categories") . $after . "\n";
		return;
	}
	if ($list && $child_of && $num_found && $recurse) {
		$pre = "\t\t<ul class='children'>";
		$post = "\t\t</ul>\n";
	} else {
		$pre = $post = '';
	}
	$thelist = $pre . $thelist . $post;
	if ($recurse) {
		return $thelist;
	}
	echo apply_filters('list_cats', $thelist);
}

function in_category($category) { // Check if the current post is in the given category
	global $post, $category_cache;
	$cats = '';
	foreach ($category_cache[$post->ID] as $cat) :
		$cats[] = $cat->category_id;
	endforeach;

	if ( in_array($category, $cats) )
		return true;
	else
		return false;
}
?>