Disable quantity input on product pages in WooCommerce

disable-quantity-input-on-product-pages-in-woocommerce.php

add_filter( 'woocommerce_quantity_input_min', 'hide_woocommerce_quantity_input', 10, 2 );
add_filter( 'woocommerce_quantity_input_max', 'hide_woocommerce_quantity_input', 10, 2 );
function hide_woocommerce_quantity_input( $quantity, $product ) {
    // only on the product page
    if ( ! is_product() ) {
        return $quantity;
    }
    return 1;
}