woocommerce_grouped_product_columns │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_grouped_product_columns', 'wp_kama_woocommerce_grouped_product_columns_filter', 10, 2 );

/**
 * Function for `woocommerce_grouped_product_columns` filter-hook.
 * 
 * @param  $array   
 * @param  $product 
 *
 * @return 
 */
function wp_kama_woocommerce_grouped_product_columns_filter( $array, $product ){

	// filter...
	return $array;
}

$array

-

$product

-

Where the hook is called

$grouped_product_columns = apply_filters(
	'woocommerce_grouped_product_columns',
	array(
		'quantity',
		'label',
		'price',
	),
	$product
);

Where the hook is used in WooCommerce