从wp_get_attachment_image_attributes过滤器中删除_wp_post_thumbnail_class_filter
原型
_wp_post_thumbnail_class_filter_remove( $attr )
源文件
路径:wp-includes/media.php
<?php
...
}
/**
...
?>
其他
英文文档:https://developer.wordpress.org/reference/functions/_wp_post_thumbnail_class_filter_remove/