passing javascript variable to php

passing javascript variable to php

I am not sure if I am doing this the right way but I can't think of any other way of doing this.  So here goes. 
In my javascript I have a "for" loop setup like this

for(var i = 0; i < data.length; i++)
{
function load_items(){
   

    $.get("list_items.php", function(data){
   
        if(data.length == 0)
        {
            return;
        }
   

        for(var j = 0; j < data.length; j++)
        {
            create_item(data[j].description, data[j].priority);
        }
       
    }, "json");  
   
}
}

I want to send the value of "i" to the php file so then I can just get a list of tasks which have task_id equal to i

So then I can just display these tasks on the webpage.

I have no idea if this is the way to do it but that's the only way I can think of.  All other ways that I tried didn't work. 

Can someone help me?