source: trunk/www.guidonia.net/wp/wp-content/themes/blueleanmagazine/functions.php@ 44

<?php

include("settings.php");

# WIDGET: Sidebar
if ( function_exists('register_sidebar') )
    register_sidebar(array(
                'name' => 'Top Sidebar',
        'before_title' => '<h2>',
        'after_title' => '</h2>',
                'before_widget' => '<div class="box">',
        'after_widget' => '</div>',
    ));

# WIDGET: Content Bottom
if ( function_exists('register_sidebar') )
    register_sidebar(array(
                'name' => 'Content Bottom',
        'before_title' => '<h2>',
        'after_title' => '</h2>',
                'before_widget' => '<div class="box">',
        'after_widget' => '</div>',
    ));

# Displays a list of pages
function dp_list_pages() {
        global $wpdb;
        $querystr = "SELECT $wpdb->posts.ID, $wpdb->posts.post_title FROM $wpdb->posts WHERE $wpdb->posts.post_status = 'publish' AND $wpdb->posts.post_type = 'page' ORDER BY $wpdb->posts.post_title ASC";
        $pageposts = $wpdb->get_results($querystr, OBJECT);
        if ($pageposts) {
                foreach ($pageposts as $post) {
                        ?><li><a href="<?php echo get_permalink($post->ID); ?>"><?php echo $post->post_title; ?></a></li><?php 
                }
        }
}

# Displays a list of categories
function dp_list_categories($num=0, $exclude='') {
        if (strlen($exclude)>0) $exclude = '&exclude=' . $exclude;
        $categories = get_categories('hide_empty=1'.$exclude);
        $first = true; $count = 0;
        foreach ($categories as $category) {
                if ($num>0) { $count++; if ($count>$num) break; } // limit
                if ($category->parent<1) {
                        if ($first) { $first = false; $f = ' class="f"'; } else { $f = ''; }
                        ?><li<?php echo $f; ?>>
                        <a href="<?php echo get_category_link($category->cat_ID); ?>"><?php echo $category->name ?><?php echo $raquo; ?></a></li>
                        <?php
                }
        }
}

# Displays a list of popular posts
function dp_popular_posts($num, $pre='<li>', $suf='</li>', $excerpt=false) {
        global $wpdb;
        $querystr = "SELECT $wpdb->posts.post_title, $wpdb->posts.ID, $wpdb->posts.post_content FROM $wpdb->posts WHERE $wpdb->posts.post_status = 'publish' AND $wpdb->posts.post_type = 'post' ORDER BY $wpdb->posts.comment_count DESC LIMIT $num";
        $myposts = $wpdb->get_results($querystr, OBJECT);
        foreach($myposts as $post) {
                echo $pre;
                ?><a class="title" href="<?php echo get_permalink($post->ID); ?>"><?php echo $post->post_title ?></a><?php
                if ($excerpt) {
                        dp_attachment_image($post->ID, 'medium', 'alt="'.$post->post_title.'"');
                        ?><p><?php echo dp_clean($post->post_content, 85); ?>... <a href="<?php echo get_permalink($post->ID); ?>">Read More</a></p><?php
                }
                echo $suf;
        }
}

# Displays a list of recent categories
function dp_recent_comments($num, $pre='<li>', $suf='</li>') {
        global $wpdb, $post;
        $querystr = "SELECT $wpdb->comments.comment_ID, $wpdb->comments.comment_post_ID, $wpdb->comments.comment_author, $wpdb->comments.comment_content, $wpdb->comments.comment_author_email FROM $wpdb->comments WHERE $wpdb->comments.comment_approved=1 ORDER BY $wpdb->comments.comment_date DESC LIMIT $num";
        $recentcomments = $wpdb->get_results($querystr, OBJECT);
        foreach ($recentcomments as $rc) {
                $post = get_post($rc->comment_post_ID);
                echo $pre;
                ?><strong><a href="<?php the_permalink() ?>#comment-<?php echo $rc->comment_ID ?>"><?php echo $rc->comment_author ?></a></strong> on <a href="<?php the_permalink() ?>#comment-<?php echo $rc->comment_ID ?>"><?php echo $post->post_title; ?></a><?php
                echo $suf;
        }
}


# Displays post image attachment (sizes: thumbnail, medium, full)
function dp_attachment_image($postid=0, $size='thumbnail', $attributes='') {
        if ($postid<1) $postid = get_the_ID();
        if ($images = get_children(array(
                'post_parent' => $postid,
                'post_type' => 'attachment',
                'numberposts' => 1,
                'post_mime_type' => 'image',)))
                foreach($images as $image) {
                        $attachment=wp_get_attachment_image_src($image->ID, $size);
                        ?><img src="<?php echo $attachment[0]; ?>" <?php echo $attributes; ?> /><?php
                }
}

# Removes tags and trailing dots from excerpt
function dp_clean($excerpt, $substr=0) {
        $string = strip_tags(str_replace('[...]', '...', $excerpt));
        if ($substr>0) {
                $string = substr($string, 0, $substr);
        }
        return $string;
}

# Displays the comment authors gravatar if available
function dp_gravatar($size=50, $attributes='', $author_email='') {
        global $comment, $settings;
        if (dp_settings('gravatar')=='enabled') {
                if (empty($author_email)) {
                        ob_start();
                        comment_author_email();
                        $author_email = ob_get_clean();
                }
                $gravatar_url = 'http://www.gravatar.com/avatar/' . md5(strtolower($author_email)) . '?s=' . $size . '&amp;d=' . dp_settings('gravatar_fallback');
                ?><img src="<?php echo $gravatar_url; ?>" <?php echo $attributes ?>/><?php
        }
}

# Retrieves the setting's value depending on 'key'.
function dp_settings($key) {
        global $settings;
        return $settings[$key];
}

?>