WooCommerce: Conditionally Force Product Quantity 1 @ Cart

There are times when the WooCommerce product settings alone are not enough. You can already tick the “Sold individually” checkbox in the “Inventory” product data tab in the single product edit page to force quantity 1 for whatever product: “Enable this to only allow one of this item to be bought in a single order“.

Problem is, you may need to set this “programmatically” (via code), based on certain conditions. One reason is that you may not want to edit hundreds of products one by one (or in bulk) – another is that you may want to “override” whatever settings based on certain conditions (for example, you set “Sold Individually”, but if the Cart total is greater than 100 you want to allow quantities greater than 1).

As you can see, in this post we will cover, once again, the magic of “conditional logic“. Enjoy!

Yes, you can force max add to cart quantity to 1 via the product settings. But code is nicer and can be made dynamic or conditional.

PHP Snippet 1: Force “Sold Individually” If Product Stock Is Low

/**
 * @snippet       Conditionally Force Sold Individually @ WooCommerce Cart
 * @how-to        Get CustomizeWoo.com FREE
 * @author        Rodolfo Melogli, BusinessBloomer.com
 * @testedwith    WooCommerce 4.5
 * @donate $9     https://businessbloomer.com/bloomer-armada/
 */

add_filter( 'woocommerce_is_sold_individually', 'bbloomer_product_max_1_cart_stock_low', 9999, 2 );

function bbloomer_product_max_1_cart_stock_low( $individually, $product ) {
	if ( $product->get_stock_quantity() < 3 ) {
		$individually = true;
	}
	return $individually;
}

PHP Snippet 2: Force “Sold Individually” If Product ACF Field Exists

/**
 * @snippet       Conditionally Force Sold Individually @ WooCommerce Cart
 * @how-to        Get CustomizeWoo.com FREE
 * @author        Rodolfo Melogli, BusinessBloomer.com
 * @testedwith    WooCommerce 4.5
 * @donate $9     https://businessbloomer.com/bloomer-armada/
 */

add_filter( 'woocommerce_is_sold_individually', 'bbloomer_product_max_1_cart_custom_field', 9999, 2 );

function bbloomer_product_max_1_cart_custom_field( $individually, $product ) {
	$acf_field_value = get_field( 'acf_field_id', $product->get_id() );
	if ( $acf_field_value && 'whatever' == $acf_field_value ) {
		$individually = true;
	}
	return $individually;
}

Where to add this snippet?

You can place PHP snippets at the bottom of your child theme functions.php file (delete "?>" if you have it there). CSS, on the other hand, goes in your child theme style.css file. Make sure you know what you are doing when editing such files - if you need more guidance, please take a look at my free video tutorial "Where to Place WooCommerce Customization?"

Does this snippet (still) work?

Please let me know in the comments if everything worked as expected. I would be happy to revise the snippet if you report otherwise (please provide screenshots). I have tested this code with Storefront theme, the WooCommerce version listed above and a WordPress-friendly hosting on PHP 7.3.

If you think this code saved you time & money, feel free to join 14,000+ WooCommerce Weekly subscribers for blog post updates or 250+ Business Bloomer supporters for 365 days of WooCommerce benefits. Thank you in advance :)

Need Help with WooCommerce?

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Rodolfo Melogli

Business Bloomer Founder

Author, WooCommerce expert and WordCamp speaker, Rodolfo has worked as an independent WooCommerce freelancer since 2011. His goal is to help entrepreneurs and developers overcome their WooCommerce nightmares. Rodolfo loves travelling, chasing tennis & soccer balls and, of course, wood fired oven pizza.

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