Force minimum and maximum quantities for a product

Forces minimum and maximum quantities for a product on the cart as well as add-to-cart URL actions.

For a more advanced version of this functionality, see WooCommerce Min/Max Quantities

add_filter( 'woocommerce_quantity_input_args', function( $args, $product ) {

	if( $product->get_id() === 33 ) {
		$args['max_value'] = 24;
		$args['min_value'] = 3;
		$args['step'] = 1;
	}

	return $args;

}, 10, 2 );

// Add To Cart Via URL
add_action( 'wp_loaded', function() {

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

	// Get Request Data
	$product_id = intval( $_REQUEST['add-to-cart'] );
	$quantity = intval( $_REQUEST['quantity'] );

	// Match Criteria
	if( $product_id != 33 ) { return; }
	if( $quantity >= 3 && $quantity <= 24 ) {
		return;
	}

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

	// Error Message
	$message = 'Sorry, but that product requires a quantity between 3 and 24.';
	wc_add_notice( $message, 'error' );

} );

Instructions for Force minimum and maximum quantities for a product

  1. Log into a staging or locally hosted clone of your site.
  2. Install and activate Code Snippets plugin.
  3. WP Admin > Snippets > Add New
  4. Copy and paste the code from the section above.
  5. Check to ensure formatting came over properly.
  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.

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License

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

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.

Disclaimer of warranty
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