用< br>替换表单输入标签

HI，我是PHP的新手，但我想格式化$ order和$ specialinstructions的输入，以便输入的/ n替换为< br /> html中的标签。我听说过使用nl2br（）和Ive尝试过多次尝试使其工作并从许多不同论坛的条目中正确使用它。任何人都可以看看我的代码，让我知道如何实现这个？！

Im new to PHP completely but Im wanting to format the inputs for $order and $specialinstructions so that the /n of input is replaced with <br /> tags in the html. Ive heard about using nl2br() and Ive tried a rediculous number of things to try to make it work and use it properly from entries from many different forums. Can anyone please have a look at my code and let me know how I can implement this?!