delete_post_thumbnail( int|WP_Post $post )

Removes the thumbnail (featured image) from the given post.

Parameters

$post

(Required) Post ID or post object from which the thumbnail should be removed.

Return

(bool) True on success, false on failure.

Source

File: wp-includes/post.php 

function delete_post_thumbnail( $post ) {
	$post = get_post( $post );
	if ( $post )
		return delete_post_meta( $post->ID, '_thumbnail_id' );
	return false;
}

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Changelog

Changelog
Version Description
3.3.0 Introduced.