我已将debug设置为true，并使用条件标记显示不同的横幅，例如：

<?php

if ( is_page( \'about\' ) || \'2\' == $post->post_parent ) {    
    // the page is "About", or the parent of the page is "About"
    $bannerimg = \'about.jpg\';

} elseif ( is_page( \'learning\' ) || \'56\' == $post->post_parent ) {  
    $bannerimg = \'teaching.jpg\';

} elseif ( is_page( \'admissions\' ) || \'15\' == $post->post_parent ) { 
    $bannerimg = \'admissions.jpg\';

} else { 
    $bannerimg = \'home.jpg\'; // just in case we are at an unclassified page, perhaps the home page
}   

?>

这会导致如下错误：

[24-Sep-2013 00:03:32] PHP Notice:  Trying to get property of non-object in D:\\Clients\\project1\\www.project1.dev\\wp-content\\themes\\custom_v1\\header.php on line 100

删除$post->post\\u parent修复了PHP通知。如果我做错了什么，有人能告诉我吗？

Location of this code:

我在标题中使用了类似于上面的代码结构。php文件。这不在任何post循环内。我在上面粘贴的成本来自http://codex.wordpress.org/Conditional_Tags

Purpose of my code:根据用户所在的页面，我需要显示不同的横幅。因此，每个页面及其子页面都有相同的横幅。

if ( is_page(\'114\') || $post->post_parent == \'114\' ) { }

甚至上面的代码也会生成错误。不确定为什么$post->post\\u Parents不被视为对象。

<?php
$bannerimg = \'home.jpg\';
$post = is_singular() ? get_queried_object() : false;
if ( ! empty($post) && is_a($post, \'WP_Post\') ) {
  if ( \'about\' == $post->post_name || \'2\' == $post->post_parent ) {    
    $bannerimg = \'about.jpg\';
  } elseif ( \'learning\' == $post->post_name || \'56\' == $post->post_parent) ) {  
    $bannerimg = \'teaching.jpg\';
  } elseif ( \'admissions\' == $post->post_name || \'15\' == $post->post_parent ) { 
    $bannerimg = \'admissions.jpg\';
  }
}