学习wordpress开发时未定义变量

Question

Hello Community当我学习wordpress时，我试图通过这行代码获得作者URL:

   <?php if ( have_posts() ) : while( have_posts() ) : the_post(); ?>
    <div>  
        <article <?php post_class(); ?>>
            <h2> <a href=" <?php the_permalink(); ?> " > <?php the_title(); ?> </a> </h2>
    
            <?php the_content(); ?>
            <footer>
                <p class="byline">
                    Author:
                    <a href="<?php echo get_author_posts_url( $post -> $post_author ); ?>">
                        <?php the_author(); ?> 
                    </a> 
                    | Date: <?php the_time( 'M. d, Y' ); ?> | 
                    Categories: <?php the_category( ', ' ); ?> | 
                    Tags: <?php the_tags( '',', ','' ); ?>
                </p>
            </footer>
            
        </article>
    </div>
    <?php endwhile; else: ?>
        <?php _e("Sorry no content found in your website please add some post to see Designs" , "phpforwp"); ?>
        
    <?php endif; ?>

显示此错误:

Author: ( ! ) Notice: Undefined variable: post_author in C:UsersApuOneDriveSiteswww.firststep.dev.ccwp-contentthemesweebablogindex.php on line 20 Call Stack #TimeMemoryFunctionLocation 10.0436481080{main}( )...index.php:0 20.0479483248require( 'C:UsersApuOneDriveSiteswww.firststep.dev.ccwp-blog-header.php' )...index.php:17 38.308825513240require_once( 'C:UsersApuOneDriveSiteswww.firststep.dev.ccwp-includestemplate-loader.php' )...wp-blog-header.php:19 48.340225637680include( 'C:UsersApuOneDriveSiteswww.firststep.dev.ccwp-contentthemesweebablogindex.php' )...template-loader.php:106 https://www.firststep.dev.cc/author/"> mridul | Date: Apr. 13, 2022 | Categories: Uncategorized | Tags:

帖子作者未定义，即使我抄袭了我的老师。(Udemy课程)。

Answer 1

您看到的错误是告诉您变量$post_author未定义。在这一行:

<a href="<?php echo get_author_posts_url( $post -> $post_author ); ?>">

你真正想要使用的是$post变量中的post_author属性，它前面没有$，所以你应该写$post->post_author，这应该返回post作者ID。

我建议看一下php的类属性