How do I call the summary on the WordPress article page?

A 360 intelligent summary is added to your website for easy indexing. one line is included. you need to call the abstract in the head tab of the article page. you can use either the get_the_excerpt or get_the_content functions. I don't know how to deal with it? {Code ...} A 360 intelligent summary is added to your website for easy indexing. one line is included. you need to call the abstract in the head tab of the article page. you can use either the get_the_excerpt or get_the_content functions. I don't know how to deal with it?

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A 360 intelligent summary is added to your website for easy indexing. one line is included. you need to call the abstract in the head tab of the article page. you can use either the get_the_excerpt or get_the_content functions. I don't know how to deal with it?

/** * 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;    }

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