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function is not described

WC_Cart::get_total_discount() public WC 1.0

Gets the total discount amount.

{} It's a method of the class: WC_Cart{}

Hooks from the method
Return

Mixed. formatted price or false if there are none

Usage

$WC_Cart = new WC_Cart();
$WC_Cart->get_total_discount();

Code of WC_Cart::get_total_discount() WC 5.7.1

public function get_total_discount() {
	return apply_filters( 'woocommerce_cart_total_discount', $this->get_discount_total() ? wc_price( $this->get_discount_total() ) : false, $this );
}