SmartyEngine PHP array for customer products

[Schonix]

Hey guys and gals,

 

I am trying to insert a link in my navbar that only shows up for certain clients that have bought a certain product...

 

Basically, I wanna use a phpArray to show a link if a product condition is met.

 

e.g.

 

{if $clientsdetails.productid="4"}

/* Navbar link href here */

{/if}

 

 

And then finally, on this page that it links to, I only want to show the page content if the same condition is met. How could I go about doing this? Thanks!