批量删除wordpress文章中的所有特色图像

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/**
 * WordPress 批量删除所有文章的特色图像
 * http://http://blog.liujason.com/archives/1024
 */
global $wpdb;
$attachments = $wpdb->get_results( "
	SELECT * 
	FROM $wpdb->postmeta 
	WHERE meta_key = '_thumbnail_id'
	" );
foreach ( $attachments as $attachment ) {
	wp_delete_attachment( $attachment->meta_value, true );
}
$wpdb->query( "
	DELETE FROM $wpdb->postmeta 
	WHERE meta_key = '_thumbnail_id'
	" );