警告：array_pop（）要求参数1为数组，在中给定null。。。在线34
使用以下函数时，我会出现以下错误。函数的输出按预期工作，但错误显示在输出之前。
<?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 } ?>
有人有这个错误的经验吗？或者看看是什么原因造成的？
代码最初来自http://wordpress.org/support/topic/custom-taxonomy-related-posts-query
问题是您在潜在数组的索引上使用array_pop。array_pop设计用于弹出数组末尾的最后一个元素。
array_pop()接受一个数组作为参数，并从数组中移除最后一个值（返回它）。如果你想得到这个数组元素的值，你应该做一些类似的事情
$rpost = $potentials[$index++];
如果你还需要将其从阵列中删除，那么你需要这样的东西：
$rpost = $potentials[$index];
unset($potentials[$index]);
$index++;