关于“Invalid arguments passed”的问题，求解

Question

求大神点解。
页面提示说：“Warning: implode(): Invalid arguments passed in /home/tumuneco/public_html/wp-content/themes/verge/carousel.php on line 8”
但是我不懂php，搞不懂改怎么修改

Answer 1

图好像有点小，具体代码如下：
<?php global $option_setting;
$count = 1;
if (isset($option_setting['carousel-enable-on-home'])) :
if( $option_setting['carousel-enable-on-home'] && (is_front_page() || is_home() )) :  ?>
    <div id="carousel-wrapper" class="container">
    <ul class="bxcarousel">
     <?php
     $args = array( 'posts_per_page' => $option_setting['carousel-count'], 'category' => implode(",",$option_setting['carousel-cats']) );
$lastposts = get_posts( $args );
foreach ( $lastposts as $post ) :
  setup_postdata( $post ); ?>
   <li><a title="<?php the_title(); ?>" href='<?php the_permalink(); ?>'>
   <?php if (has_post_thumbnail()) : 
$thumb_id = get_post_thumbnail_id();
$thumb_url = wp_get_attachment_image_src($thumb_id,'carousel', true);
echo "<img class='carousel-image' src='".$thumb_url[0]."' title='".get_the_title()."'>";
else :
echo "<img class='carousel-image' src='".get_template_directory_uri()."/assets/images/placeholder2.jpg' title='".get_the_title()."'>";
endif; ?></a></li>
<?php endforeach; 
wp_reset_postdata(); 
?>            
     </ul>   
</div>
    
<?php endif;
endif;?>

Answer 2

错误原因：
$option_setting['carousel-cats']不是数组  
需要打印出来是什么类型

Answer 3

var_dump($option_setting);输出来是什么？

Answer 4

var_dump(isset($option_setting['carousel-cats']));
print_r($option_setting['carousel-cats']);看看是否為空。

Answer 5

$args = array( 'posts_per_page' => $option_setting['carousel-count'], 'category' => implode(",",$option_setting['carousel-cats']) );
改为：$category = isset($option_setting['carousel-cats'])? implode(",",$option_setting['carousel-cats']) : '';
$args = array( 'posts_per_page' => $option_setting['carousel-count'], 'category' => $category );

Answer 6

$args = array( 'posts_per_page' => $option_setting['carousel-count'], 'category' => implode(",",$option_setting['carousel-cats']) );
改为：$category = isset($option_setting['carousel-cats'])? implode(",",$option_setting['carousel-cats']) : '';
$args = array( 'posts_per_page' => $option_setting['carousel-count'], 'category' => $category );这样就可以避免为空出现警告了。