WordPress at a glance
filter is not described

loop_shop_columns filter-hook . WC 1.0

Usage

add_filter( 'loop_shop_columns', 'filter_function_name_2140' );
function filter_function_name_2140( $columns ){
	// filter...

	return $columns;
}
$columns
-

Where the hook is called

wc_get_default_products_per_row()
loop_shop_columns
woocommerce/includes/wc-template-functions.php 393
$columns = apply_filters( 'loop_shop_columns', $columns );

Where in WP core the hook is used WooCommerce

Usage not found.