php 检查页面是父页面还是子页面？
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Check if a page is a parent or if it's a child page?
提问by Rob
Is it possible to check if a page is a parent or if it's a child page?
是否可以检查页面是父页面还是子页面？
I have my pages set up like this:
我的页面设置如下：
-- Parent
-- 家长
---- Child page 1
---- 子页面 1
---- Child page 2
---- 子页面 2
etc.
等等。
I want to show a certain menu if it's a parent page and a different menu if it's on the child page.
如果它是父页面，我想显示某个菜单，如果它在子页面上，我想显示一个不同的菜单。
I know I can do something like below but I want to make it a bit more dynamic without including specific page ID's.
我知道我可以做类似下面的事情，但我想让它更加动态而不包含特定的页面 ID。
<?php
if ($post->post_parent == '100') { // if current page is child of page with page ID 100
// show image X
}
?>
回答by Alex
You can test if the post is a subpage like this:
*(from http://codex.wordpress.org/Conditional_Tags)*
您可以测试帖子是否是这样的子页面：
*（来自http://codex.wordpress.org/Conditional_Tags）*
<?php
global $post; // if outside the loop
if ( is_page() && $post->post_parent ) {
// This is a subpage
} else {
// This is not a subpage
}
?>
回答by Matthew T Rader
I know this is an old question but I was searching for this same question and couldn't find a clear and simple answer until I came up with this one. My answer doesn't answer his explanation but it answers the main question which is what I was looking for.
我知道这是一个老问题，但我一直在寻找同样的问题，直到我想出这个问题才找到一个清晰而简单的答案。我的回答没有回答他的解释，但它回答了我一直在寻找的主要问题。
This checks whether a page is a child or a parent and allows you to show, for example a sidebar menu, only on pages that are either a child or a parent and not on pages that do not have a parent nor children.
这会检查页面是子页面还是父页面，并允许您仅在子页面或父页面上显示，例如侧边栏菜单，而不是在没有父页面或子页面的页面上显示。
<?php
global $post;
$children = get_pages( array( 'child_of' => $post->ID ) );
if ( is_page() && ($post->post_parent || count( $children ) > 0 )) :
?>
回答by Queli Coto
Put this function in the functions.php file of your theme.
把这个函数放在你的主题的functions.php 文件中。
function is_page_child($pid) {// $pid = The ID of the page we're looking for pages underneath
global $post; // load details about this page
$anc = get_post_ancestors( $post->ID );
foreach($anc as $ancestor) {
if(is_page() && $ancestor == $pid) {
return true;
}
}
if(is_page()&&(is_page($pid)))
return true; // we're at the page or at a sub page
else
return false; // we're elsewhere
};
Then you can use it:
然后你可以使用它：
<?php
if(is_page_child(100)) {
// show image X
}
?>
