php - WordPress Get the Page ID outside the loop

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php - WordPress Get the Page ID outside the loop

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

I want to get the page ID before starting the loop in WordPress. I am using

$page = get_query_var('page_id');

Apparently, it returns nothing.

I just want to check a page for its ID and add a class to <body> tag based on it.

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1 Answer

深蓝 · Answer 1 · 2021-10-23T17:43:13+0000

If you're using pretty permalinks, get_query_var('page_id') won't work.

Instead, get the queried object ID from the global $wp_query:

// Since 3.1 - recommended!
$page_object = get_queried_object();
$page_id     = get_queried_object_id();


// "Dirty" pre 3.1
global $wp_query;

$page_object = $wp_query->get_queried_object();
$page_id     = $wp_query->get_queried_object_id();

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