php 如何在 Wordpress Admin 中获取帖子 ID

How to get Post ID in Wordpress Admin

提问by Victor

I'm developing a Wordpress plugin and I need to get the current Post ID
in the Write Post / Write Page editing screen(outside the loop).

我正在开发一个 Wordpress 插件，我需要 在“写帖子”/“写页面”编辑屏幕（循环外）中获取当前的帖子 ID。

I also need to do it before the "admin_print_scripts" hook, since I would like to pass some data to a javascript file.

我还需要在“admin_print_scripts”挂钩之前执行此操作，因为我想将一些数据传递给 javascript 文件。

I can't use:

我不能使用：

$id = $_GET['post'];

because the url doesn't include this variable when you are adding a new post or page.

因为当您添加新帖子或页面时 url 不包含此变量。

So far I've tried these options but none of them worked:

到目前为止，我已经尝试过这些选项，但都没有奏效：

A) This returns an ID of 0

A) 这将返回 ID 0

function myplugin_setup() {
    global $wp_query;
    $id = $wp_query->get_queried_object_id();
    var_dump($id);
}

add_action('admin_init', 'myplugin_setup' );  

B) This returns an ID of null

B) 这将返回一个空 ID

function myplugin_setup() {
    global $wp_query;
    $id = $wp_query->post->ID;
    var_dump($id);
}

add_action('admin_init', 'myplugin_setup' );

C) This also returns an ID of null

C) 这也返回一个空 ID

function myplugin_setup() {
    global $post;
    $id = $post->ID;
    var_dump($id);
}

add_action('admin_init', 'myplugin_setup' );

回答by Ciprian Tepes

Make sure you call the global $post after the WordPress query. If you add an action to init or admin_init, the query isn't ready so there's nothing you can get out of the global $post variable.

确保在 WordPress 查询后调用全局 $post。如果您向 init 或 admin_init 添加操作，则查询尚未准备好，因此您无法从全局 $post 变量中获得任何信息。

My advice would be to check the action reference from this page: http://codex.wordpress.org/Plugin_API/Action_Referenceand choose one that works for you.

我的建议是检查此页面中的操作参考：http: //codex.wordpress.org/Plugin_API/Action_Reference并选择一个适合您的操作。

For example, I did this:

例如，我这样做了：

add_action( 'admin_head', 'check_page_template' );
function check_page_template() {
    global $post;
    if ( 'page-homepage.php' == get_post_meta( $post->ID, '_wp_page_template', true ) ) {
        // The current page has the foobar template assigned
        // do something

    }
}

And I was able to get the page ID in WP admin

我能够在 WP admin 中获取页面 ID

回答by Caleb

Use:

用：

global $post

at the beginning of your function. You should then have access to $post->ID to get the id of the current post. This will work for new and existing posts.

在您的函数开始时。然后，您应该可以访问 $post->ID 以获取当前帖子的 ID。这将适用于新的和现有的职位。

回答by Tomá? Kapler

Problem is, you are using admin_init hook. If you look into Action Reference - http://codex.wordpress.org/Plugin_API/Action_Reference- you will see, that this hook is actually called BEFORE quering posts, that's why those variables you use are not yet filled.

问题是，您正在使用 admin_init 钩子。如果你查看 Action Reference - http://codex.wordpress.org/Plugin_API/Action_Reference- 你会看到，这个钩子实际上被称为 BEFORE 查询帖子，这就是你使用的那些变量尚未填充的原因。

You can use some later action (with some is_admin() check), or you may use admin init hook to add action to some later hook, so again it will be used only on admin.

您可以使用一些稍后的操作（通过一些 is_admin() 检查），或者您可以使用 admin init 钩子将操作添加到某个稍后的钩子中，因此它只会在 admin 上使用。

回答by Dan Fluture

The 'admin_init' action is triggered before any other hook when a user accesses the admin area. It is triggered before the new post gets an id.

当用户访问管理区域时，'admin_init' 操作在任何其他钩子之前触发。它在新帖子获得 id 之前触发。

To get the new post id you can use 'save_post', which is an action triggered whenever a post or page is created or updated (http://codex.wordpress.org/Plugin_API/Action_Reference/save_post).

要获取新的帖子 ID，您可以使用“save_post”，这是在创建或更新帖子或页面时触发的操作（http://codex.wordpress.org/Plugin_API/Action_Reference/save_post）。

First you can include your scripts using 'admin_enqueue_scripts', then use 'save_post' to get the new post id. The 'admin_print_scripts' is triggered after 'save_post' and you can use wp_localize_script (https://codex.wordpress.org/Function_Reference/wp_localize_script), or other method to pass the new post id to your javascript.

首先，您可以使用“admin_enqueue_scripts”包含您的脚本，然后使用“save_post”获取新的帖子 ID。'admin_print_scripts' 在 'save_post' 之后触发，您可以使用 wp_localize_script ( https://codex.wordpress.org/Function_Reference/wp_localize_script) 或其他方法将新的帖子 ID 传递给您的 javascript。

I needed something similar, but it was used in a class.

我需要类似的东西，但它是在课堂上使用的。

class Foo {
    // this will hold the id of the new post
    private $postId = null;

    public function __construct()
    {
        // the actions are triggered in this order
        add_action('admin_enqueue_scripts', array($this, 'EnqueueScripts'));
        add_action('save_post', array($this, 'SavePost'));
        add_action('admin_print_scripts', array($this, 'LocalizeScripts'));
    }

    // enqueue your scripts and set the last parameter($in_footer) to true
    public function EnqueueScripts()
    {
        wp_enqueue_script('myJs', 'js/my.js', array('jquery'), false, true); 
    }

    // use wp_localize_script to pass to your script the post id
    public function LocalizeScripts()
    {
        wp_localize_script('myJs', 'myJsObject', array('postId'=>$this->GetPostId()));
    }

    // if $post_id is different from global post id you are in the write/create post page, else you are saving an existing post
    public function SavePost($post_id)
    {
        if($post_id != $this->GetPostId())
        {
            $this->SetPostId($post_id);
        }
    }

    private function GetPostId()
    {
        if (!$this->postId) {
            global $post;
            if($post)
            {
                $this->SetPostId($post->ID);
            }
        }

        return $this->postId;
    }

    private function SetPostId($postId)
    {
        $this->postId = $postId;
    }
}

Now, in your javascript you can use:

现在，在您的 javascript 中，您可以使用：

myJsObject.postId

回答by Mel Macaluso

For anyone still wondering the correct hook to call, or one of the many in the wordpress admin lifecycle, is: admin_head

对于仍然想知道要调用的正确钩子或 wordpress 管理生命周期中的众多钩子之一的任何人，是：admin_head

as follows:

如下：

function myplugin_setup() {
    global $post;
    $id = $post->ID;
    var_dump($id);
}

add_action('admin_head', 'myplugin_setup' );

回答by bingjie2680

If it is a new post/page, I guess the id does not exists yet, because the post has not been published/added to DB. If you are trying to edit a post/page, I think you may use $id = $_GET['post'];

如果它是一个新的帖子/页面，我猜这个 id 还不存在，因为该帖子尚未发布/添加到数据库。如果您正在尝试编辑帖子/页面，我认为您可以使用$id = $_GET['post'];

回答by Muhammad Jawad Arshad

this may work :

这可能有效：

$id = get_the_ID();