wordpress关键词和描述添加代码实例

<?php
if (is_home()){
        //这里描述在前*******
 $description = "在此输入描述";
 $keywords = "在此输入关键词";
}
elseif (is_category()){
 $keywords = single_cat_title('', false);
 $description = category_description();
}
elseif (is_tag()){
 $keywords = single_tag_title('', false);
 $description = tag_description();
}
$keywords = trim(strip_tags($keywords));
$description = trim(strip_tags($description));
?>
<meta name="keywords" content="<?php echo $keywords; ?>" />
<meta name="description" content="<?php echo $description; ?>" />

<?php
//如果是首页
if (is_home()){
   $keywords = "你网站首页的关键字，自己修改吧";
   $description = "你网站首页的描述，自己修改吧";}
    //如果是文章页
elseif (is_single()){
    //默认使用文章页添加关键字
   $keywords = get_post_meta($post->ID, "keywords", true);        
     //如果为空，使用标签作为关键字
if($keywords == ""){ 
   $tags = wp_get_post_tags($post->ID);
   foreach ($tags as $tag){
   $keywords = $keywords.$tag->name.",";} 
     //去掉最后一个,
     $keywords = rtrim($keywords, ', ');        
}        //默认使用文章页添加描述
$description = get_post_meta($post->ID, "description", true);
        //如果为空，使用文章前100个字作为描述
if($description == ""){ 
               if($post->post_excerpt){ 
                  $description = $post->post_excerpt;    
     }else{
           $description = mb_strimwidth(strip_tags(apply_filters('the_content',$post->post_content)),0,200);
            }        }}
//如果是页面，使用页面添加的关键字和描述
elseif (is_page()){
        $keywords = get_post_meta($post->ID, "keywords", true);
        $description = get_post_meta($post->ID, "description", true);}
//如果是分类页，使用分类名作为关键字，分类描述作为描述
elseif (is_category()){
        $keywords = single_cat_title('', false);
        $description = category_description();}
//如果是标签页，使用标签名作为关键字，标签描述作为描述
elseif (is_tag()){
        $keywords = single_tag_title('', false);        
        $description = tag_description();}
//去掉两段空格
        $keywords = trim(strip_tags($keywords));
        $description = trim(strip_tags($description));?>
<meta name="keywords" content="<?php echo $keywords; ?>" />
<meta name="description" content="<?php echo $description; ?>" />

<meta name="keywords" content="<?php echo $keywords; ?>" />
<meta name="description" content="<?php echo $description; ?>" />