<?php
//預設基本介紹
$df_description = "基本網站介紹文字，以120~150字為限";
//單頁面時，抓取文章摘要作為介紹
$c_description = get_the_excerpt();
apply_filters('the_excerpt_rss', $c_description);

if(is_home()) {
$description = &$df_description;
}else if (is_single()){
if ($post->post_excerpt)
{
if($c_description != "")
{
$description = $c_description;
}else{
$description = $post->post_excerpt;
}
} else {
$description = strip_tags(substr_utf8($post->post_content,0,240));
$description = preg_replace("/\n/","",str_replace("　","",$description));
}
}else if(is_category()){
$description = strip_tags(category_description());
$description = preg_replace("/\n/","",$description);
}
?>

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