How could I get the value of an element with JavaScript or PHP and store it globally

I have a list of items that I get from my database via PHP. When I click one of the items it redirects to a site which will be filled with the data connected to the given item from the database, so this will be a dynamic site we could say. What I want to do is when I click one of the items I want to store that item's value so when it redirects me to the dynamic site I know what was the item I clicked so I can get the rest of the data to my clicked item to load on the dynamic site.

Or if you could do this with PHP that would be the best.