datatable.php

<link rel="stylesheet" type="text/css" href="dt/jquery.dataTables.min.css">
<script type="text/javascript" language="javascript" src="dt/jquery-1.12.0.min.js"></script>
<script type="text/javascript" language="javascript" src="dt/jquery.dataTables.min.js"></script>
<script>		
$(document).ready(function() {

    $('#example').DataTable( {

      "aaSorting" :[[0,'desc']],

	  //"lengthMenu":[[20,50, 100, -1], [20,50, 100,"All"]]

	});

} );
</script>