How to get jquery variable values into php variable

Question

I am getting some values from html ul elements like this

function myFunction() {
    var values =[];
    $('#sortable2').each(function(){ // id of ul
        var li = $(this).find('li')//get each li in ul
        var res = li.text().split("::");
        console.log(res)//get text of each li
    })
}

Now I want to get the res values in php variables I am trying this but it is not working

function myFunction() {
    var values =[];
    $('#sortable2').each(function(){ // id of ul
        var li = $(this).find('li')//get each li in ul
        var res = li.text().split("::");
        <?php
            $arr = res;
            echo "alert('$arr')";
        ?>
        console.log(res) //get text of each li
    })
}

Please tell me where I am going wrong.