WordPress at a glance
filter is not described

woocommerce_format_postcode filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_format_postcode', 'filter_function_name_8853', 10, 2 );
function filter_function_name_8853( $trim, $country ){
	// filter...

	return $trim;
}
$trim
-
$country
-

Where the hook is called

wc_format_postcode()
woocommerce_format_postcode
woocommerce/includes/wc-formatting-functions.php 998
return apply_filters( 'woocommerce_format_postcode', trim( $postcode ), $country );

Where in WP core the hook is used WooCommerce

Usage not found.