Wordpress Get the Page ID outside the loop

2019-01-16 06:56发布

站内问答 / PHP
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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.

标签： php wordpress
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11条回答
Explosion°爆炸
2楼-- · 2019-01-16 07:40

If you by any means searched this topic because of the post page (index page alternative when using static front page), then the right answer is this:

if (get_option('show_on_front') == 'page') {
    $page_id = get_option('page_for_posts');
    echo get_the_title($page_id);
}

(taken from Forrst | Echo WordPress "Posts Page" title - Some code from tammyhart)

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老娘就宠你
3楼-- · 2019-01-16 07:42

If you're on a page and this does not work:

$page_object = get_queried_object();
$page_id     = get_queried_object_id();

you can try to build the permalink manually with PHP so you can lookup the post ID:

// get or make permalink
$url = !empty(get_the_permalink()) ? get_the_permalink() : (isset($_SERVER['HTTPS']) ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
$permalink = strtok($url, '?');

// get post_id using url/permalink
$post_id = url_to_postid($url);

// want the post or postmeta? use get_post() or get_post_meta()
$post = get_post($post_id);
$postmeta = get_post_meta($post_id);

It may not catch every possible permalink (especially since I'm stripping out the query string), but you can modify it to fit your use case.

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家丑人穷心不美
4楼-- · 2019-01-16 07:43

This function get id off a page current.

get_the_ID();
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唯我独甜
5楼-- · 2019-01-16 07:50

You can also create a generic function to get the ID of the post, whether its outside or inside the loop (handles both the cases):

<?php

/**
 * @uses WP_Query
 * @uses get_queried_object()
 * @see get_the_ID()
 * @return int
 */
function get_the_post_id() {
  if (in_the_loop()) {
       $post_id = get_the_ID();
  } else {
       global $wp_query;
       $post_id = $wp_query->get_queried_object_id();
         }
  return $post_id;
} ?>

And simply do:

$page_id = get_the_post_id();
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Animai°情兽
6楼-- · 2019-01-16 07:51

I have done it in the following way and it has worked perfectly for me.

First declared a global variable in the header.php, assigning the ID of the post or page before it changes, since the LOOP assigns it the ID of the last entry shown:

$GLOBALS['pageid] = $wp_query->get_queried_object_id();

And to use anywhere in the template, example in the footer.php:

echo $GLOBALS['pageid];

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