单击按钮/输入时，在PHP会话变量中添加信息

I'm working on an app that sells items. Each items has differents informations about them and I'd like to store these informations in a PHP variable session when I click on a button (button that adds it to a 'bag'). I want to store them so I can reuse them to show the products in the bag on an other page.

How do I proceed to stock those infos in a session variable ?

In that exemple, I would like to store the Code, Dimensions and Forme value on the button click so I can reuse them in an other page.

<ul>
  <li>
    Code : Value from DB
  </li>
  <li>
    Dimensions :  Value from DB
  </li>
  <li>
    Forme : Value from DB
  </li>
</ul>

<button>
  Ajouter à ma quotation
</button>

Edit: https://jsfiddle.net/c6h8dfus/