woothemes / woocommerce

		$quantity 			= empty( $_REQUEST['quantity'] ) ? 1 : wc_stock_amount( $_REQUEST['quantity'] );

		$passed_validation 	= apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity );

		if ( $passed_validation && WC()->cart->add_to_cart( $product_id, $quantity ) !== false ) {

			wc_add_to_cart_message( array( $product_id => $quantity ), true );

			return true;

		}

		return false;

	}

			// Add to cart validation

			$passed_validation 	= apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity, $variation_id, $variations );

			if ( $passed_validation && WC()->cart->add_to_cart( $product_id, $quantity, $variation_id, $variations ) !== false ) {

				wc_add_to_cart_message( array( $product_id => $quantity ), true );

				return true;

			}

		}

		return false;

	}