Change Woocommerce Variations from Selects to Radio buttons

functions.php

function variation_radio_buttons($html, $args)
{
    $args = wp_parse_args(apply_filters('woocommerce_dropdown_variation_attribute_options_args', $args), array(
        'options' => false,
        'attribute' => false,
        'product' => false,
        'selected' => false,
        'name' => '',
        'id' => '',
        'class' => '',
        'show_option_none' => __('Choose an option', 'woocommerce'),
    ));

    if (false === $args['selected'] && $args['attribute'] && $args['product'] instanceof WC_Product) {
        $selected_key = 'attribute_' . sanitize_title($args['attribute']);
        $args['selected'] = isset($_REQUEST[$selected_key]) ? wc_clean(wp_unslash($_REQUEST[$selected_key])) : $args['product']->get_variation_default_attribute($args['attribute']);
    }

    $options = $args['options'];
    $product = $args['product'];
    $attribute = $args['attribute'];
    $name = $args['name'] ? $args['name'] : 'attribute_' . sanitize_title($attribute);
    $id = $args['id'] ? $args['id'] : sanitize_title($attribute);
    $class = $args['class'];
    $show_option_none = (bool)$args['show_option_none'];
    $show_option_none_text = $args['show_option_none'] ? $args['show_option_none'] : __('Choose an option', 'woocommerce');

    if (empty($options) && !empty($product) && !empty($attribute)) {
        $attributes = $product->get_variation_attributes();
        $options = $attributes[$attribute];
    }

    $radios = '<div class="variation-radios">';

    if (!empty($options)) {
        if ($product && taxonomy_exists($attribute)) {
            $terms = wc_get_product_terms($product->get_id(), $attribute, array(
                'fields' => 'all',
            ));

            foreach ($terms as $term) {
                if (in_array($term->slug, $options, true)) {
                    $radios .= '<div><input type="radio" name="' . esc_attr($name) . '" value="' . esc_attr($term->slug) . '" ' . checked(sanitize_title($args['selected']), $term->slug, false) . '><label for="' . esc_attr($term->slug) . '">' . esc_html(apply_filters('woocommerce_variation_option_name', $term->name)) . '</label></div>';
                }
            }
        } else {
            foreach ($options as $option) {
                $checked = sanitize_title($args['selected']) === $args['selected'] ? checked($args['selected'], sanitize_title($option), false) : checked($args['selected'], $option, false);
                $radios .= '<div><input type="radio" name="' . esc_attr($name) . '" value="' . esc_attr($option) . '" id="' . sanitize_title($option) . '" ' . $checked . '><label for="' . sanitize_title($option) . '">' . esc_html(apply_filters('woocommerce_variation_option_name', $option)) . '</label></div>';
            }
        }
    }

    $radios .= '</div>';

    return $html . $radios;
}

add_filter('woocommerce_dropdown_variation_attribute_options_html', 'variation_radio_buttons', 20, 2);