我正在Wordpress中为特定页面模板构建一个metabox库。我在仪表板上有以下警告通知：

警告：in\\u array（）要求参数2为array，在

警告针对代码行：if ( in_array( $post_type, $post_types ) ) {

public function add_meta_box( $post_type ) {

    $post_types = apply_filters( \'sortable_wordpress_gallery_post_types\', array( \'post\' ) );
    $post_types = apply_filters( \'sortable_wordpress_gallery_\' . $this->id .  \'_post_types\',  $post_types );

    if ( in_array( $post_type, $post_types ) ) {
        add_meta_box(
            $this->id,
            $this->title,
            array( $this, \'render_meta_box_content\' ),
            $post_type,
            $this->context,
            $this->priority
            );
    }
}

这是我在其中指定应在其中显示元框的页面模板的代码。

add_filter( \'sortable_wordpress_gallery_post-metabox_post_types\',  \'first_gallery_only_on_page\' );
function first_gallery_only_on_page( $post_types ) {

  global $post;
  if(!empty($post)) {
    $pageTemplate = get_post_meta($post->ID, \'_wp_page_template\', true);
    if($pageTemplate == \'page-coworking.php\' ) {

         return array( \'page\' );

    }
  }

}

我知道我的一个参数为null，但在使用它之前我找不到设置它的方法。非常感谢。

// no matter what the value here, you can forget about it (because in the next line of code you assing a new value to the same variable)
$post_types = apply_filters( \'sortable_wordpress_gallery_post_types\', array( \'post\' ) );

// only this really matters
$post_types = apply_filters( \'sortable_wordpress_gallery_\' . $this->id .  \'_post_types\',  $post_types );

function first_gallery_only_on_page ($post_types) {
    global $post;

    if (!empty($post)) {
        $pageTemplate = get_post_meta($post->ID, \'_wp_page_template\', true);

        if ($pageTemplate == \'page-coworking.php\' ) {
            return array( \'page\' );
        }
    }

    return $post_types; // add this line
}