您需要使用save_post_post 挂钩和使用$wpdb->update() 方法代码-

add_action( \'my_save_post_post\', \'save_post_post\' );
function my_save_post_($post_ID, $post )
{
    global $wpdb;

    $post_content = \'You are viewing \'. $post->post_title .\'! These are great hairstyle designs in our \'. get_the_category_list( \', \', \'\', $post_ID ) .\' section. Hope you try this look and feel on your hair today. Ever considered changing it up, you might like this\';

    $random = get_posts( array(
        \'post__not_in\'    => $post_ID,
        \'posts_per_page\'  => \'1\',
        \'post_type\'       => \'post\',
        \'post_status\'     => \'publish\',
        \'orderby\'         => \'rand\'
    ));

    if( $random )
    {
        $rpost = array_shift( $random );
        if( isset($rpost->ID) )
        {
            $post_content .= sprintf( 
                \' <a href="%s">%s</a>\', 
                $rpost->post_title, 
                get_permalink( $rpost->ID )
            );
        }
    }

    $wpdb->update( 
        $wpdb->posts, 
        array( \'post_content\' => $post_content ), 
        array( \'ID\' => $post_ID ) 
    );
}