批量删除wordpress文章特色图像

编辑函数文件functions.php添加以下内容

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'
	" );

保存后所有文章的特色图像都将删除完，执行一次后把添加的代码删除，不然以后无法使用特色图像

参考资料：
http://www.wpbeginner.com/wp-tutorials/how-to-bulk-remove-featured-images-from-posts-in-wordpress/
http://www.wpdaxue.com/bulk-remove-featured-images-from-posts.html

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