(hook_prefix)image_id filter-hook . WC 1.0

Usage

add_filter( '(hook_prefix)image_id', 'filter_function_name_2675', 10, 2 );
function filter_function_name_2675( $parent_data_image_id, $that ){
	// filter...

	return $parent_data_image_id;
}

$parent_data_image_id

-

$that

-

Where the hook is called

$image_id = apply_filters( $this->get_hook_prefix() . 'image_id', $this->parent_data['image_id'], $this );

Where in WP core the hook is used WooCommerce