woocommerce_process_login_errors filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_process_login_errors', 'filter_function_name_9118', 10, 3 );
function filter_function_name_9118( $validation_error, $creds_user_login, $creds_user_password ){
	// filter...

	return $validation_error;
}

$validation_error

-

$creds_user_login

-

$creds_user_password

-

Where the hook is called

$validation_error = apply_filters( 'woocommerce_process_login_errors', $validation_error, $creds['user_login'], $creds['user_password'] );

Where in WP core the hook is used WooCommerce