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Most solutions I found are for front-end use. This is for a plugin, so the all activity is in the back-end.

How do I get the page ID that's being currently use(edited) in the admin?

Note I'm out of the loop. I just need to get the ID of page(not posts) that I'm currently seeing in the back-end.

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You can get it from URL wp-admin/post.php?post=14&action=edit –  Bindiya Patoliya Sep 14 '13 at 5:07
2  
I see the URL as a last shot. I hope there is more elegant way to do that. –  Daniel Sep 14 '13 at 5:11
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2 Answers

up vote 1 down vote accepted

You can also use

$post_id = $_GET['post'];

Or you can use a hook (probably better).

function id_WPSE_114111() {
    global $post;
    $id = $post->ID;
    // do something
}

add_action( 'admin_notices', 'id_WPSE_114111' );

You will need to add a conditional since this will run on all admin pages, I recommend using get_current_screen();

For example to run only on pages:

function id_WPSE_114111() {

    global $my_admin_page;
    $screen = get_current_screen();

    if ( is_admin() && ($screen->id == 'page') ) {
        global $post;
        $id = $post->ID;
        var_dump($id);
    }
}

add_action( 'admin_notices', 'id_WPSE_114111' );
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I need for pages. –  Daniel Sep 14 '13 at 5:27
    
This also works for pages. –  Wyck Sep 14 '13 at 5:34
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You can add this code in functions.php file and it will give you a meta box above the publish settings box when editing a post or page.

 <?php

function cf_post_id() {
    global $post;

   // Get the data
   $id = $post->ID;

   // Echo out the field
   echo '<input type="text" name="_id" value="' . $id . '" class="widefat" disabled />';
  }

 function ve_custom_meta_boxes() {
    add_meta_box('projects_refid', 'Post ID', 'cf_post_id', 'post', 'side', 'high');
    add_meta_box('projects_refid', 'Page ID', 'cf_post_id', 'page', 'side', 'high');
   }
   add_action('add_meta_boxes', 've_custom_meta_boxes');

?>
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