woocommerce_add_to_cart_validation

apply_filters('woocommerce_add_to_cart_validation') is found 5 times:

• /includes/class-wc-ajax.php line 465

   
  		$product_id        = apply_filters( 'woocommerce_add_to_cart_product_id', absint( $_POST['product_id'] ) );
  		$product           = wc_get_product( $product_id );
  		$quantity          = empty( $_POST['quantity'] ) ? 1 : wc_stock_amount( wp_unslash( $_POST['quantity'] ) );
  		$passed_validation = apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity );
  		$product_status    = get_post_status( $product_id );
  		$variation_id      = 0;
  		$variation         = array();
  
  		if ( $product && 'variation' === $product->get_type() ) {
  			$variation_id = $product_id;
  

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• /includes/class-wc-cart-session.php line 482

  					$variations[ $meta->key ] = $meta->value;
  				}
  			}
  
  			if ( ! apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity, $variation_id, $variations, $cart_item_data ) ) {
  				continue;
  			}
  
  			// Add to cart directly.
  			$cart_id          = WC()->cart->generate_cart_id( $product_id, $variation_id, $variations, $cart_item_data );
  			$product_data     = wc_get_product( $variation_id ? $variation_id : $product_id );
  

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• /includes/class-wc-form-handler.php line 840

  	 * @return bool success or not
  	 */
  	private static function add_to_cart_handler_simple( $product_id ) {
  		$quantity          = empty( $_REQUEST['quantity'] ) ? 1 : wc_stock_amount( wp_unslash( $_REQUEST['quantity'] ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended
  		$passed_validation = apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity );
  
  		if ( $passed_validation && false !== WC()->cart->add_to_cart( $product_id, $quantity ) ) {
  			wc_add_to_cart_message( array( $product_id => $quantity ), true );
  			return true;
  		}
  		return false;
  

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• /includes/class-wc-form-handler.php line 872

  				}
  				$quantity_set = true;
  
  				// Add to cart validation.
  				$passed_validation = apply_filters( 'woocommerce_add_to_cart_validation', true, $item, $quantity );
  
  				// Suppress total recalculation until finished.
  				remove_action( 'woocommerce_add_to_cart', array( WC()->cart, 'calculate_totals' ), 20, 0 );
  
  				if ( $passed_validation && false !== WC()->cart->add_to_cart( $item, $quantity ) ) {
  					$was_added_to_cart      = true;
  

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• /includes/class-wc-form-handler.php line 922

   
  			$variations[ sanitize_title( wp_unslash( $key ) ) ] = wp_unslash( $value );
  		}
  
  		$passed_validation = apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity, $variation_id, $variations );
  
  		if ( ! $passed_validation ) {
  			return false;
  		}
  
  		// Prevent parent variable product from being added to cart.
  

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