问将Javascript变量传递给PHP链接

EN

$('.pay').click(function (ev) {
    ev.preventDefault();
    var bookingId = $(this).attr('data-id');
    $('#payModal').modal('show'); 
    $('#payModal').attr('bookingId',bookingId); //added in this line, setting the bookingId variable as an attribute of the modal.
});

<button onclick="cartredirect()">Proceed to Cart</button>

<script>
     function cartredirect(){
          var bookingId = $("#payModal").attr('bookingId'); //returns the modal attribute from before.
          window.location = "<?= $host . $basepath ?>/payments/cart/" + bookingId; //now as a result, the page with the correctly appended variable can load.
     };
</script>

window.location = '?booking_id=' + bookingId; //navigate to the current page
window.location = './othersite.php?booking_id=' + bookingId; //navigate to another page

//lets take the following URL as an example
'https://www.example.com/blog/pages/2984?id=3'

''       //current page --> 'https://www.example.com/blog/pages/2984'
'./'     //current 'directory' you are in --> 'https://www.example.com/blog/pages'
'../'    //parent 'directory' --> 'https://www.example.com/blog'
'../../' //2nd parent 'directory' --> 'https://www.example.com'
'/'      //root 'directory' --> 'https://www.example.com'

$('.pay').on ('click',function (ev) {
ev.preventDefault();
    $('#payModal').modal('show');
    var bookingId = $(this).attr('data-id');
 });