data-table-update-option.php

CSS cdn 
<link rel="stylesheet" href="https://cdn.datatables.net/1.12.1/css/jquery.dataTables.min.css">
<link rel="stylesheet" href="https://cdn.datatables.net/buttons/2.2.3/css/buttons.dataTables.min.css">

JS CDN and Script



<script src="https://code.jquery.com/jquery-3.5.1.js"></script>
<script src="https://cdn.datatables.net/1.12.1/js/jquery.dataTables.min.js"></script>
<script src="https://cdn.datatables.net/buttons/2.2.3/js/dataTables.buttons.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.1.3/jszip.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.53/pdfmake.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.53/vfs_fonts.js"></script>
<script src="https://cdn.datatables.net/buttons/2.2.3/js/buttons.html5.min.js"></script>
<script src="https://cdn.datatables.net/buttons/2.2.3/js/buttons.print.min.js"></script>
<script src="https://cdn.datatables.net/buttons/2.2.3/js/buttons.colVis.min.js"></script>


<script>
    $(document).ready(function() {
    $('#datatable_example').DataTable( {
        dom: 'Bfrtip',
        buttons: [
            'copy', 'csv', 'excel', 'pdf', 'print', 'colvis'
        ]
    } );
} );
</script>