我有一个名为$speakers的变量，当从下拉列表中选择时，它会显示事件的发言人列表。问题是，如果没有为某个事件选择任何发言者，则所有发言者的列表将显示在该部分中，而不是像应该显示的那样在该部分中显示任何内容，因为没有选择任何内容。以下是代码块：

    $speakers = get_post_meta( $post->ID, \'min_webinar_speaker\', false );

    $args = array(
      \'posts_per_page\'   => -1,
      \'orderby\'          => \'date\',
      \'order\'            => \'DESC\',
      \'include\'          => $speakers,
      \'post_type\'        => \'speaker\',
      \'post_status\'      => \'publish\',
      \'suppress_filters\' => true
    );
    $speakers = get_posts( $args );






    <?php for  ($i = 0; $i < count($speakers); $i++) {
                $speaker = $speakers[$i];
                if ( $i % 2 == 0 ) {
                    ?>
                    <div class="row">
                    <?php
                }
            ?>

                    <article class="subscriber col-sm-6">
                        <div class="row">
                            <div class="col-sm-6">
                                <?php echo get_the_post_thumbnail($speaker->ID, \'thumbnail\'); ?>
                            </div>
                            <div class="col-sm-6 subscriber-desc">
                                <h5 class="moderator"><?php
                                    global $wp_query;
                                    $postid = $wp_query->post->ID;
                                    echo get_post_meta($speaker->ID, \'min_speaker_speaker_role\', true);
                                    wp_reset_query();
                                    ?>    
                                </h5>
                                <h1><?php echo $speaker->post_title; ?></h1>
                                <?php echo wpautop( $speaker->post_content); ?>
                            </div>
                        </div>
                    </article>
                <?php //} ?>
                <?php 
                if ( $i % 2 == 1 || ($i+1) == count($speakers) ) {
                    ?> </div> <!-- test--><?php 
                }

            }?>

如果您有任何关于如何重新处理此代码块以使其正常工作的想法，我们将不胜感激。

$speakers = get_post_meta( $post->ID, \'min_webinar_speaker\', false );

if ($speakers != \'\') { // <- you may need to do a more thorough check than this
    ... run the code...
}