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Sell a Category in Multiples (Cases)

Makes the total quantity from a category a multiple of a case size, for example 6 or 12 bottles, and explains how many more to add.

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Code

$wpide_case = array(
    'categories' => array( 'wine' ), // Category slugs.
    'size'       => 6,               // Case size.
);

add_action( 'woocommerce_check_cart_items', function () use ( $wpide_case ) {
    $count = 0;

    foreach ( WC()->cart->get_cart() as $item ) {
        if ( has_term( $wpide_case['categories'], 'product_cat', $item['product_id'] ) ) {
            $count += (int) $item['quantity'];
        }
    }

    $remainder = $wpide_case['size'] > 0 ? $count % $wpide_case['size'] : 0;

    if ( $count > 0 && $remainder ) {
        wc_add_notice( sprintf( 'These products are sold in cases of %1$d. Please add %2$d more to complete a case.', $wpide_case['size'], $wpide_case['size'] - $remainder ), 'error' );
    }
} );

Notes

Different products in the category can be mixed within a case.

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