WordPress Page ID not Post ID

Is there any way to get ID of the current page which shows posts in loop? I need to get this ID in header.php.

<?php
     $query = new WP_Query( array('post_type' => 'portfolio') );
     while ( $query->have_posts() ) : 
          $query->the_post(); 
 ?>                           
 //here I added posts
 <?php endwhile; ?>

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2 comments

  1. It depends on where you want to get this ID. If you are trying to get it on the page that you have set to show posts (ie, a page set as your “blog”), you need to use:

    $page_id = get_option( 'page_for_posts' );
    

    If you want to get this on any other page and you’re using a custom query, you can get this (before your custom loop) using:

    global $post;
    $page_id = $post->ID;
    

    Because you’re using WP_Query and the_post(), you’ll want to reset the post data after your custom loop with wp_reset_postdata(); to use template tags again. I suspect that’s where your problem is – you’re hijacking the template tags with your custom loop and not resetting them.