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<?php
function get_post_thumbnail_id( $post_id = null ) {
    $post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
    return get_post_meta( $post_id, '_thumbnail_id', true );
}
?>

• Function Reference/get post thumbnail id « WordPress Codex
  Description. If a thumbnail is set - Returns the ID of the Thumbnail attached to the post; If no such attachment exists, the function returns null (Empty value) ...
  codex.wordpress.org
• (Call to undefined function get_post_thumbnail_id()) - WordPress Trac
  Hope this isn't a duplicate, but post thumbnails seem to be broken in the current trunk revision (13871). If I upload an image on a post I get: Fatal error: Call to ...
  core.trac.wordpress.org
• Fatal error: Call to undefined function get_post_thumbnail_id() in
  Fatal error: Call to undefined function get_post_thumbnail_id() in (4 posts). crowdsourcewriting. Member Posted 1 year ago #. I've been working with my WP/ BP ...
  wordpress.org
• get_post_thumbnail_id | Will Ayers
  Tag Archives: get_post_thumbnail_id. WordPress: Get Url Of Featured Image. Posted on April 28, 2011 by cointilt · Reply. There is a very easy way to display the ...
  cointilt.me

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