<https://larryullman.com/forums/index.php?/topic/29-part-3-physical-products-ch8-creating-a-catalog/#comment-304>
<http://schema.org/text>
"Larry, \nI'm very grateful for your time and patience to show me in such a detailed advice on debugging skill.    I will try it again later.  \ni'm now busying with curl technology required in billing.php page. Luckily I've found I'm able to learn it from your book -PHP 5 Advanced (2dn edition). \n"
<https://larryullman.com/forums/index.php?/topic/29-part-3-physical-products-ch8-creating-a-catalog/#comment-308>