WordPress at a glance
filter is not described

woocommerce_attribute_default_is_variation filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_attribute_default_is_variation', 'filter_function_name_3852' );
function filter_function_name_3852( $empty ){
	// filter...

	return $empty;
}
$empty
-

Where the hook is called

WC_AJAX::add_attribute()
woocommerce_attribute_default_is_variation
woocommerce/includes/class-wc-ajax.php 578
$attribute->set_variation( apply_filters( 'woocommerce_attribute_default_is_variation', 0 ) );

Where in WP core the hook is used WooCommerce

Usage not found.