纯代码替换All-in-One-SEO插件,实现WordPress SEO优化

<title><?php
/*
?    * Print the <title> tag based on what is being viewed.
?    */
global $page, $paged;     wp_title( '-', true, 'right' );
// Add the blog name.
bloginfo( 'name' );
// Add the blog description for the home/front page.
$site_description = get_bloginfo( 'description', 'display' );
if ( $site_description && ( is_home() || is_front_page() ) )
echo " – $site_description";
// Add a page number if necessary:
if ( $paged >= 2 || $page >= 2 )
echo ' – ' . sprintf( __( 'Page %s', 'twentyten' ), max( $paged, $page ) );
?></title>
<?php
if (is_home()){
$description = "学做网站论坛https://www.xuewangzhan.com/描述";
$keywords = "学做网站论坛https://www.xuewangzhan.com/关键词";

}
elseif (is_single()) {
if ($post->post_excerpt) {
$description     = $post->post_excerpt;
} else {
$description = substr(strip_tags($post->post_content),0,220);
}
$description2 = mb_strimwidth(strip_tags(apply_filters('the_content', $post->post_content)), 0, 200, "…");
$keywords = get_post_meta($post->ID, "keywords", true);
if($keywords == '') {
$tags = wp_get_post_tags($post->ID);
foreach ($tags as $tag ) {
$keywords = $keywords . $tag->name . ", ";
}
$keywords = rtrim($keywords, ', ');
}
}
elseif (is_category()) {
$description = category_description();
$keywords = single_cat_title('', false);
}
elseif (is_tag()){
$description = tag_description();
$keywords = single_tag_title('', false);
}
$description = trim(strip_tags($description));
$keywords = trim(strip_tags($keywords));
?>
<meta name="description" content=”<?php echo $description; ?>" />
<meta name="keywords" content=”<?php echo $keywords; ?>" />