array_pop() 期望参数 1 是按分类代码在 Wordpress 相关帖子中的数组

Question

警告：array_pop() 期望参数 1 为数组，第 34 行 ... 中给出 null

在使用以下函数时出现以下错误。该函数的输出按预期工作，只是错误出现在输出之前。

<?php 
global $post;

//Get the terms for the current post
$terms = get_the_terms( $post->ID , 'character', 'string');
echo $terms[1];
$potentials = array();
$c = 0;
$totalFound = 0;

//Gather your posts for each term
foreach($terms as $term){
   $q = array(
    'character' => $term->slug, //term to retrieve from custom taxonomy
    'numberposts' => 3,  //limit to 4 posts
    'post_type' => 'videos', //get only posts
    'exclude' => $post->ID //exclude current post
   );
   $posts = get_posts($q);
   $totalFound+= count($posts);
   $potentials[$c++] = array_reverse($posts);
}

$count = 0;  //The number of good posts we've found
$index = 0;  //Number of posts we've tried
$max = $totalFound > 3 ? 3 : $totalFound;  //The max we can find
$posts = array();

//Now pick one post from each term until we reach our quota,
//or have checked them all
while($count < $max){

  //Pop off a post to use
  $rpost = array_pop($potentials[$index++]);

  //if we got a post (if there was one left)
  if($rpost){
    //don't take duplicates
    if(!isset($posts[$rpost->ID])){
      $posts[$rpost->ID] = $rpost;
      $count++;
    }
  }
  $index = ($index % 3); //rotate through the 4 term arrays
}
foreach($posts as $post){
    setup_postdata($post);
    $exclusive = get('aoexclusive_yes');
    if(!$exclusive) {$exclusive = null;} else {$exclusive = 'exclusive';}
    $image = wp_get_attachment_image_src( get_post_thumbnail_id(  $post->ID ), "video-thumb" );
?>
                    <div class="thumb-post<?php echo ' '.$exclusive; ?>">
<?php if($image) { ?>

                        <a class="featured-image" href="<?php the_permalink(); ?>"><img src="<?php echo $image[0]; ?>" /></a>
<?php } else { ?>

                        <a class="featured-image" href="<?php the_permalink(); ?>"><img src="<?php bloginfo('stylesheet_directory'); ?>/assets/images/default.jpg" /></a>
<?php } ?>
                        <h1><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h1>
<?php ao_post_meta(); ?>    

                    </div>
<?php } ?>

有谁有过此错误的经验或了解可能导致此错误的原因吗？

代码最初来自 http://wordpress.org/support/topic/自定义分类相关帖子查询

Answer 1

问题是您在电位数组的索引上使用 array_pop 。
array_pop 旨在弹出数组末尾的最后一个元素。

Answer 2

array_pop() 接受一个数组作为参数，并从数组中删除最后一个值（返回它）。如果你想获取该数组元素的值，你应该这样做，

$rpost = $potentials[$index++];

如果你还需要从数组中删除它，那么你需要这样的事情：

$rpost = $potentials[$index];
unset($potentials[$index]);
$index++;