woocommerce_email_recipient_backorder filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_email_recipient_backorder', 'filter_function_name_2684', 10, 3 );
function filter_function_name_2684( $option, $args, $null ){
	// filter...

	return $option;
}

$option

-

$args

-

$null

-

Where the hook is called

apply_filters( 'woocommerce_email_recipient_backorder', get_option( 'woocommerce_stock_email_recipient' ), $args, null ),

Where in WP core the hook is used WooCommerce