One way to pass an array of values would be to append multiple instances of 'paramName' (where 'paramName' is any name you'd like to give the query parameter, of course). In other words, this query string:
When I click any of these links, they take me to "mywebsite.com/?run=showX" - which in turn directs me to my front page. I think this means that the function is not running, and I'm wondering if anyone has any suggestions as to why. I've tried testing without the function, and with just echoes indicating that a function has ran, instead - and these haven't done anything. I am still directed to the url indicated in the link and nothing beyond that seems to happen. Have I set the function to run incorrectly?