How to get variable from JavaScript to PHP [duplicate]

function tableText(tableCell) {
    var x =tableCell.innerHTML;
    console.log(x);
    $.ajax({  
        type: 'POST',
        dataType: 'json',
        url: 'try.php', 
        data: {
            x:x
        },
        success: function(text) {
            //SWAL
            Swal.fire(
                'Success!!',
                text,
                'success'
            )
        }
     });
 }


<!-- SWEET ALERT -->
<script src="//cdn.jsdelivr.net/npm/sweetalert2@11"></script>

<?php
$_REQUEST['x'];//here you receive what you send thru ajax

//here goes your insert

echo json_encode('insert was successfull')//this msg is what you will see when you return text
?>