February 24, 2011 
Definition:
function set_post_thumbnail( $post, $thumbnail_id ) {}
Sets a post thumbnail.
Parameters
- int|object $post: Post ID or object where thumbnail should be attached.
- int $thumbnail_id: Thumbnail to attach.
Return values
returns:True on success, false on failure.
Source code
function set_post_thumbnail( $post, $thumbnail_id ) {
$post = get_post( $post );
$thumbnail_id = absint( $thumbnail_id );
if ( $post && $thumbnail_id && get_post( $thumbnail_id ) ) {
$thumbnail_html = wp_get_attachment_image( $thumbnail_id, 'thumbnail' );
if ( ! empty( $thumbnail_html ) ) {
update_post_meta( $post->ID, '_thumbnail_id', $thumbnail_id );
return true;
}
}
return false;
}
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