Accept multiple product quantity add-to-cart in single request

Handles multiple simple product and quantity add-to-cart items in a single request. Requests take the comma delimited form:

/cart/?add-to-cart=1,2,3&quantity=1,1,1
add_action( 'template_redirect', function() {

	// Only For Multiple Add-to-cart Requests
	if(
		! class_exists( 'WC_Form_Handler' )
		|| empty( $_REQUEST['add-to-cart'] )
		|| ! strpos( $_REQUEST['add-to-cart'], ',' )
	) {
		return;
	}

	// Get Requests
	$product_ids = explode( ',', $_REQUEST['add-to-cart'] );
	$quantities = explode( ',', $_REQUEST['quantity'] );

	// Products And Quantity Counts Must Match
	if( count( $product_ids ) !== count( $quantities ) ) {
		return;
	}

	// Stop Default Handler
	remove_action( 'wp_loaded', [ 'WC_Form_Handler', 'add_to_cart_action' ], 20 );

	// Loop Add-to-cart Requests
	foreach( $product_ids as $i => $product_id ) {
		$product_id = absint( $product_id );
		$quantity = wc_stock_amount( absint( $quantities[$i] ) );
		$added_to_cart = WC()->cart->add_to_cart( $product_id, $quantity );
		if( $added_to_cart ) {
			wc_add_to_cart_message( [ $product_id => $quantity ], true );
		}
	}

} );

How to use

PHP Code Snippets

  1. Log into a staging, development, or locally hosted clone of your site
  2. Install and activate Code Snippets
  3. WP Admin > Snippets > Add New
  4. Copy and paste the code from the Description tab above
  5. Check to ensure formatting came over properly and no syntax errors show up in the editor
  6. Customize the code as desired
  7. Add a meaningful title
  8. Select whether to run on front-end or back-end (or both)
  9. Click “Save and Activate”
  10. Test your site to ensure it works
  11. Disable if any problems, or recover
  12. Repeat for live environment

License

All code snippets are licensed GPLv2 (or later) matching WordPress licensing.

Disclaimer of warranty:

Except when otherwise stated in writing the copyright holders and/or other parties provide the program as-is without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.

Support

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  2. Describe your expected outcome(s).
  3. List steps to reproduce the issue.
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