WordPress 文章頁面如何調用摘要？

給自己網站添加了360智能摘要，便於收錄，其中有一行，需要在文章頁的head標籤中調用文章摘要，自己採用了get_the_excerpt和get_the_content函數都不行。不知該如何處理？

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給自己網站添加了360智能摘要，便於收錄，其中有一行，需要在文章頁的head標籤中調用文章摘要，自己採用了get_the_excerpt和get_the_content函數都不行。不知該如何處理？

/** * Custom Post Excerpt */ function wn_get_the_title($limit) {  global $post;  $title = sysSubStr( get_the_title(), $limit, true );  return $title;}function wn_get_the_excerpt($limit) {  global $post;  $excerpt = sysSubStr( get_the_excerpt(), $limit, true );  return $excerpt;}function wn_get_the_content($limit) {  global $post;  $content = sysSubStr( get_the_content(), $limit, true );  return $content;}// set the excerpt lengthfunction custom_excerpt_length(){  return 250; }add_filter( 'excerpt_length', 'custom_excerpt_length' );// set the excerpt more textfunction custom_excerpt_more( $more ) {  return '……';}add_filter( 'excerpt_more', 'custom_excerpt_more' );function sysSubStr($string,$length,$append = false) {     if(strlen($string) <= $length )     {         return $string;     }     else     {         $i = 0;         while ($i < $length)         {             $stringTMP = substr($string,$i,1);             if ( ord($stringTMP) >=224 )             {                 $stringTMP = substr($string,$i,3);                 $i = $i + 3;             }             elseif( ord($stringTMP) >=192 )             {                 $stringTMP = substr($string,$i,2);                 $i = $i + 2;             }             else             {                 $i = $i + 1;             }             $stringLast[] = $stringTMP;         }         $stringLast = implode("",$stringLast);         if($append)         {             $stringLast .= "……";         }         return $stringLast;     } } 

    function kankana_get_meta_description(){        $description = '';        $length = 100;        //if on home page        if(is_home() || is_front_page()){            $description = get_bloginfo( 'description' );        }elseif(is_singular()){            //if viewing a post/page            global $post;            $striped_content = wp_strip_all_tags( remove_all_shortcodes($post->post_content), true);            $description = mb_substr( $striped_content, 0, $length );        }        //elseif(is_archive())        return $description;    }

usage

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