Post-ID in url differs from $post->ID

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I’ve got a page with a blogroll in the left column and a sidbar in the right one. When I try to retrieve the page-id inside of the sidebar like: 

echo $post->ID;
echo get_the_ID();

The result is 3726 but the page URI is page_id=3722 ! I’m really confused now. I badly have to catch the real page id to be able to use custom fields (with the right values).

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EDIT:

I just noticed that 3726 is the id of the last blog element being displayed. But how to grab the page id?

Post Views: 1

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2 comments

  1. There are two ways to get what you need. One is mentioned in Identify the page being shown while in The Loop:

    $post_id = get_queried_object_id();

    Unfortunately, this might break. get_queried_object_id() looks in the global variable $wp_query for the ID, and that variable can be overwritten during the page rendering by query_posts(). The same is true for functions like is_page().

    But you can fetch the real post ID earlier, during template_redirect, store its value, and get it in your widget class.

    First we need a helper function that collects the post ID for later usage:

    add_action( 'template_redirect', 'collect_real_post_id' );

function collect_real_post_id()
{
    static $post_id = 0;

    if ( is_singular() && 'wp_head' === current_filter() )
        $post_id = get_queried_object_id();

    return $post_id;
}

    And now you can use that value wherever you want, for example in your widget() method:

    class My_Widget extends WP_Widget
{

    public function widget( $args, $instance )
    {
        $post_id = collect_real_post_id();

        if ( ! $post_id ) // 0 evaluates to FALSE
            return;

        // do something with the post ID
    }
}

  2. Actually get_queried_object_id() should do this trick but it’s not storing the proper page id – like toscho mentioned it might break.

    There’s an easy ways around this problem and I always prefer the easiest possible solution. So I came around with this one.

    1. I switched the permalink settings to ‘pagename’
    2. Now my url’s are
      like that: http://www.mypage.com/examplepage/ and I can use now the
      uri without the slashes to feed the method get_page_by_path()

    The resulting code:

    function get_page_real_id_by_uri()
{
    $uri =  $_SERVER['REQUEST_URI'];
    $uri = str_replace("/", "", $uri);
    return get_page_by_path($uri)->ID;
}

    I’m not sure if it’s possible in WordPress (I’m new to it) to declare two same path names – this might be a weak point of this solution. But so far it works perfectly.

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