wordpress不使用插件页面头部动态添加每个页面的keyword与摘要

wordpress易于使用，用来记录一些日志与发布一些内容比较方便。但是默认页面不输出关键字与摘要。当然有安装上一些SEO的插件就Ok了，但实测安装插件后台加载很慢。直接修改代码用hook 来添加进来。目前判断了主页、目录页、内容页。各自提取关联的内容填充。

方法如下：

require_once( ABSPATH . ‘wp-content/index.php’ );

<?php

/**

* Loads the WordPress environment and template.

*

* @package WordPress

*/

if ( ! isset( $wp_did_header ) ) {

$wp_did_header = true;

// Load the WordPress library.

require_once( dirname( __FILE__ ) . ‘/wp-load.php’ );

// Set up the WordPress query.

wp();

// Load the theme template.

require_once( ABSPATH . WPINC . ‘/template-loader.php’ );

}

function get_cats_name() {

$allcats=get_categories();

foreach ($allcats as $category)

{

$keywords[] = $category->cat_name;

}

return $keywords;

}

// Meta SEO

function meta_SEO() {

global $post;

$output = ”;

if (is_single()){//如果是文章页

$keywords = ”;

$description = ”;

if ($post->post_excerpt) {//如果文章摘要存在就以文章摘要为描述

$description = $post->post_excerpt;

$description = str_replace(“\r\n”,””,$description);

$description = str_replace(“\n”,””,$description);

$description = str_replace(“\””,”\'”,$description);

$description .= ‘…’;

} else {//如果文章摘要不存在就截断文章前200字为描述

$description = mb_substr(strip_tags($post->post_content),0,200);

$description = str_replace(“\r\n”,””,$description);

$description = str_replace(“\n”,””,$description);

$description = str_replace(“\””,”\'”,$description);

$description .= ‘…’;

}

$tags = wp_get_post_tags($post->ID);//取文章标签

foreach ($tags as $tag ) {

$keywordarray[] = $tag->name;

}

//以文章标签为关键字

$keywords = implode(‘,’,array_unique((array)$keywordarray));

} elseif( is_category() ) {//如果是分类页

global $cat;

$blog_title = get_bloginfo(‘name’);

$blog_desc = get_bloginfo(‘description’);

$cat_name = single_cat_title(‘-‘,false);

//wp_list_categories();

$sub_types = get_categories(“child_of={$cat}&hide_empty=0”);

$keywords = ”;

if($sub_types)

{

foreach($sub_types as $k => $v)

{

$keywords .= $v->name.’,’;

}

}

$keywords .= $blog_title.’,’.$blog_desc;

$description = ‘分类’.$cat_name.’ ‘.$blog_title.’ ‘.$blog_desc;

} elseif( is_home() ) {//如果是主页

$blog_title = get_bloginfo(‘name’);

$blog_desc = get_bloginfo(‘description’);

$keywords = $blog_title.’-‘.$blog_desc;

$description = ‘首页 ‘.$blog_title.’-‘.$blog_desc;

} else {//其它页

$blog_title = get_bloginfo(‘name’);

$blog_desc = get_bloginfo(‘description’);

$keywords = $blog_title.’-‘.$blog_desc;;

$description = ‘其他 ‘.$blog_title.’-‘.$blog_desc;;

}

//输出关键字

$output .= ‘<meta name=”keywords” content=”‘ . $keywords . ‘” />’ . “\n”;

$output .= ‘<meta name=”description” content=”‘ . $description . ‘” />’ . “\n”;

//输出描述

echo “$output”;

}

add_action(‘wp_head’, ‘meta_SEO’);