Getting a dynamically named php variable with javascript

I'm currently in the middle of programming something and I've ran into an annoying problem...

my function here takes an ID that is set when the user on my website clicks a button, now long story short this particular function generates graphs depending on the button clicked, my issue is the information for the graphs is taken from a MYSQL database in php earlier, and named dynamically, so the button with the ID one, connects to some php information called $exampleHere1;

heres my code, this is working however currently it's hard coded.

function createGlobals(ID){

        stringVisitsCost = [<?php echo $stringVisitsCost1 ; ?>];
        stringVisitsImpressions = [<?php echo $stringVisitsImpressions1; ?>];
        stringSMImpressions = [<?php echo $stringSMImpressions1; ?>];

        drawChart();

    }

As you can see the ID is passed in when the button is pressed earlier on, I've tested that and it does pass in the correct ID, my issue is I'm not sure how I'm going to make this function make use of the ID as the information is stored in PHP, and of course PHP Cannot take information from Javascript.

It would be amazing if there was some way of slotting the ID variable in the short php segment, with some fancy syntax, or any solutions you can suggest would be useful really to avoid me having to use a non-salable case statement or something...

Thanks very much in advance guys! Have a great day,

I'll be working on this all night so any suggestions I'll try to reply as soon as possible, Thanks again guys.

EDIT: following the comments I've tried to use AJAX to parse the variable to php, though this is my first time using ajax

function createGlobals(ID){

        //post the ID from JS to PHP using AJAX
        $.ajax({
                url: '<?php echo $_SERVER['PHP_SELF'];?>',
                type: 'POST',
                data: { ID: ID },
                success: function(data) {

                    stringVisitsCost = [<?php

                    if(isset($_POST['ID'])){

                        $ID = $_POST['ID'];

                        echo ${"stringVisitsCost" . $ID};

                    }?>]

                }
        });

        drawChart();

    }

I like this idea of using AJAX, however it's not currently working, potentially a due to a syntax issue, or my general lack of knowledge in ajax, is this correct syntax or is the issue with trying to achieve this in the first place?