<div id="sidebar">
  <div id="search">
    <form id="searchform" method="get" action="<?php bloginfo('siteurl'); ?>">
      <input type="text" value="<?php the_search_query(); ?>" name="s" id="s" size="30" x-webkit-speech />
      <button type="submit" id="searchsubmit"><i class="iconfont">&#337;</i></button>
    </form>
  </div>
  <div class="sidebar">
    <?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('内容页侧栏') ) : ?>
    <div class="widget">
      <h3>分类目录</h3>
      <ul>
        <?php wp_list_categories('depth=1&title_li=0&orderby=name&show_count=1'); ?>
      </ul>
    </div>
    <div id="related_post" class="widget">
      <h3><?php $category = get_the_category(); echo $category[0]->cat_name; ?>下的最新文章</h3>
      <?php
    		if(is_single()){
    	        $cats = get_the_category();
    	    }
    	       foreach($cats as $cat){
    	        $posts = get_posts(array(
        	        'category' => $cat->cat_ID,
            	    'exclude' => $post->ID,
                	'showposts' => 10,
             	));
			echo '<ul>';
			foreach($posts as $post){
				echo '<li><a href="'.get_permalink($post->ID).'">'.$post->post_title.'</a></li>';
        	}
			echo '</ul>';
	        }
		?>
    </div>
    <div class="widget">
      <h3>随机文章</h3>
      <ul>
        <?php $rand_posts = get_posts('numberposts=10&orderby=rand');  foreach( $rand_posts as $post ) : ?>
        <li><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php echo mb_strimwidth(get_the_title(), 0, 42, '...'); ?></a></li>
        <?php endforeach; ?>
      </ul>
    </div>
    <div class="widget">
      <h3>标签云</h3>
      <div class="tagcloud">
        <?php wp_tag_cloud();?>
      </div>
    </div>
    <?php endif; ?>
  </div>
</div>