请在主题函数中添加以下代码行。php显示一个新列，该列将在您的帖子中显示摘录。

function pkb_get_excerpt($post_ID) {
    $content_post = get_post($post_ID);
$content = $content_post->post_content;
    if ($content) {
      return $content;
    }
}

// ADD NEW COLUMN
function pkb_columns_head($defaults) {
    $defaults[\'excerpt\'] = \'excerpt\';
    return $defaults;
}

// SHOW THE EXCERPT
function pkb_columns_content($column_name, $post_ID) {
    if ($column_name == \'excerpt\') {
        $post_content = pkb_get_excerpt($post_ID);
        echo $str1= substr ($post_content,0,50);

    }
}

add_filter(\'manage_posts_columns\', \'pkb_columns_head\');
add_action(\'manage_posts_custom_column\', \'pkb_columns_content\', 10, 2);