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post_thumbnail_id

apply_filters ( ‘post_thumbnail_id’, int|false $thumbnail_id , int|WP_Post|null $post )

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Filters the post thumbnail ID.

Parameters

$thumbnail_id int | false
Post thumbnail ID or false if the post does not exist.
$post int | WP_Post | null
Post ID or WP_Post object. Default is global $post .

Source 

return (int) apply_filters( 'post_thumbnail_id', $thumbnail_id, $post );

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Used by Description
guet_post_thumbnail_id() wp-includes/post-thumbnail-template.php

Retrieves the post thumbnail ID.

Changuelog

Versionen Description
5.9.0 Introduced.

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