这是我的第一个插件，或多或少是从头开始的，我想我几乎可以让它工作了，但还没有完全实现。该插件的目的是获取所有子页面，显示它们的缩略图、标题等。现在我编写了插件，它给了我0个输出。。。为什么？可能有很多事情我都做错了，但我决定开始在get\\u页面部分寻找错误。如果我添加print_r(\'$child_query\') 和$child_query = get_pages($args); 这不应该至少输出一些东西吗？

问为什么print_r(\'$child_query\') 不返回任何内容？

我的代码有问题的代码。。。

<?php
/*
Plugin Name: Child Pages Querry
Author: Sten Winroth
Plugin URI: 
Description: 
Version: 1.0
Author URI: 
Domain Path: /languages
Text Domain: 
*/

new childPagesQuerry();
class childPagesQuerry {

private $ver = \'1.0\';

function __construct(){
add_action("init", array(&$this, "init"));
add_shortcode(\'child_query\', \'child_query_frontend\');
}

public function init()
{
add_post_type_support(\'page\', \'excerpt\');
}
private function child_query(){
    // Determine parent page ID
    $parent_page_id = ( \'0\' != $post->post_parent ? $post->post_parent : $post->ID );

    // Get child pages as array
    $args = array(
        \'child_of\' => $parent_page_id,
        \'post_type\' => \'page\',
        \'orderby\' => \'menu_order\',
        \'order\' => \'ASC\',
        \'posts_per_page\' => 100,
     );
    $child_query = get_pages($args);
    print_r($child_query);

    $child_pages = array();

    while ( $child_query->have_posts()) {
        $child_query->the_post();
            if ( \'\' != get_the_title() ) {
        $title = get_the_title();
        $excerpt = get_the_excerpt();
        $id = get_the_ID();
        $thumbnail = get_the_post_thumbnail(\'(thumbnail\');
        $permalink = get_permalink();
        $child_pages[] = array(\'title\' => $title, \'excerpt\' => $excerpt, \'id\' => $id, \'thumbnail\' => $thumbnail, \'permalink\' => $permalink);
        }
    }
} //end child_query
private function child_query_frontend($child_pages) {
        echo \'<div class="row-fluid">\';
        echo \'<ul class="thumbnails">\';
        foreach ($child_pages as $key => $value) {
            ?>
            <li class="span3">
        <div class="thumbnail">
            <img src="<?php echo $value[\'thumbnail\']; ?>" alt="" height="42" width="42">
            <div class="caption">
            <h3><?php echo $value[\'title\']; ?></h3>
            <p><?php echo $value[\'excerpt\'] ?></p>
            <p><a class="btn btn-primary" href="<?php echo $value[\'permalink\']; ?>">Läs mer.</a></p>
            </div>
        </div>
    </li>
        <?php }
        echo \'</ul><!--thumbnails-->\';
        echo \'</div><!--row-fluid-->\';
} //end frontend

}// end class