จะระบุไอดีอินพุทที่ซ้ำกันที่เกิดจากการวนลูปยังไงครับ

<?php 
        								if ($result['logs_status'] == 1) {
        									echo '<button type="submit" class="btn btn-success btn-sm" name="btn-return" id="btn-return"><span class="glyphicon glyphicon-ok" aria-hidden="true">
        									</span> Returned</button>';
        								}
        								elseif ($result['logs_status'] == 2) {
        									echo '<button type="submit" class="btn btn-danger btn-sm" name="btn-not" id="btn-not" machineId="'.stripcslashes($result['id']).'"><span class="glyphicon glyphicon-remove" aria-hidden="true">
        									</span> Not Returned</button>';
        								}
        								elseif ($result['logs_status'] == 3) {
        									echo '<button type="button" class="btn btn-warning btn-sm"><span class="glyphicon glyphicon-time" aria-hidden="true"></span> Pending</button>';
        								}
        								elseif ($result['logs_status'] == 4) {
        									echo '<button type="button" class="btn btn-info btn-sm"><span class="glyphicon glyphicon-cog" aria-hidden="true"></span> Working</button>';
        								}
  									 ?>

<script type="text/javascript">
  	$(document).ready(function() {
    $('[id="btn-not"]').click(function() {
    	var b = 1;
    	var id = $(this).attr("machineId");
    	//alert(id);
    if(b != ''){
      var urlval = 'status='+b+'&id='+id;
      alert(urlval);
      $.ajax({
        type : 'POST',
        data : urlval,
        url : 'update-status.php',
      success:function(data, textStatus, jqXHR){
        if (textStatus == 'success'){
          //alert(textStatus);
          $('[id="btn-not"]').html('<i class="fa fa-refresh fa-spin"></i> กำลังส่งคืน...');
          $('#alert').append('<div class="alert alert-success"><strong>Updated!</strong> Indicates a successful or positive action.</div>');
          setTimeout("location.href = 'return_wait.php';",2000);
        }
        else {
          $('#alert').append('<div class="alert alert-warning"><strong>Fail!</strong> Indicates a successful or positive action.</div>');
        }
      }
      });
    }
      return false;
    }); // click
  }); // document
</script>