Đổi số lượng sản phẩm thành dạng select

function woocommerce_quantity_input($args = array(), $product = null, $echo = true)
{
    if (is_null($product)) {
        $product = $GLOBALS['product'];
    }

    $defaults = array(
        'input_id' => uniqid('quantity_'),
        'input_name' => 'quantity',
        'input_value' => '1',
        'classes' => apply_filters('woocommerce_quantity_input_classes', array('input-text', 'qty', 'text'), $product),
        'max_value' => apply_filters('woocommerce_quantity_input_max', -1, $product),
        'min_value' => apply_filters('woocommerce_quantity_input_min', 0, $product),
        'step' => apply_filters('woocommerce_quantity_input_step', 1, $product),
        'pattern' => apply_filters('woocommerce_quantity_input_pattern', has_filter('woocommerce_stock_amount', 'intval') ? '[0-9]*' : ''),
        'inputmode' => apply_filters('woocommerce_quantity_input_inputmode', has_filter('woocommerce_stock_amount', 'intval') ? 'numeric' : ''),
        'product_name' => $product ? $product->get_title() : '',
    );

    $args = apply_filters('woocommerce_quantity_input_args', wp_parse_args($args, $defaults), $product);

    $args['min_value'] = max($args['min_value'], 0);
    $args['max_value'] = 0 < $args['max_value'] ? $args['max_value'] : 10;


    if ('' !== $args['max_value'] && $args['max_value'] < $args['min_value']) {
        $args['max_value'] = $args['min_value'];
    }

    $options = '';

    for ($count = $args['min_value']; $count <= $args['max_value']; $count = $count + $args['step']) {

        if ('' !== $args['input_value'] && $args['input_value'] >= 1 && $count == $args['input_value']) {
            $selected = 'selected';
        } else $selected = '';

        $options .= '<option value="' . $count . '"' . $selected . '>' . $count . '</option>';
    }

    $string = '<div class="isures-custom--qty_dropdown"><select name="' . $args['input_name'] . '">' . $options . '</select><span class="isures-label--qty">Quantity</span></div>';

    if ($echo) {
        echo $string;
    } else {
        return $string;
    }
}

.single-product .isures-custom--qty_dropdown{
	width: 30%;
}
.isures-custom--qty_dropdown{
	position: relative;
	width: 100%;
	height: 54px;
	margin-bottom: 15px;
	margin-right: 15px;
	-webkit-box-shadow: 0 1px 2px 0 rgb(0 0 0 / 15%);
    box-shadow: 0 1px 2px 0 rgb(0 0 0 / 15%);
	cursor: pointer
}
.isures-custom--qty_dropdown select {
	width: 100%;
	height: 54px;
    padding-right: 1.75rem;
    background-color: transparent;
    padding: 1.5rem 0.625rem 0.375rem;
    font-size: 16px;
    color: #4d4d4d;
    border: 1px solid rgba(127, 127, 127, 0.3);
    border-radius: 3px;
	cursor: pointer
}
span.isures-label--qty {
    position: absolute;
    top: 0.525rem;
    left: 0.625rem;
    z-index: 2;
    pointer-events: none;
    opacity: 0.6;
    -webkit-transition: 0.12s;
    transition: 0.12s;
    -webkit-transition-delay: 0.12s;
    transition-delay: 0.12s;
    -webkit-transition-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transition-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    line-height: 1;
    color: #4d4d4d;
    font-size: 13px;
    font-style: normal;
    font-weight: 400;
    text-transform: none !important;
}
.isures-custom--qty_dropdown select, .isures-custom--qty_dropdown select option {
    border: none;
    box-shadow: none;
}