mysql - Repeating Results PHP Query While Loop -

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i'm retrieving data mysql ajax , php without refreshing , issue results displayed duplicate . want 1 instance of username display .

the table contains username has unique index set not allow duplicate names (i think) while statement believe causing results duplicate

how can please ? correct display once instance of each username . sorry in advance don't know hopeful can .

  <?php   include('..\db.php');   $con = mysqli_connect($dbsrvname, $dbusername, $dbpassword, $dbname);   $q1 = mysqli_query($con,"select * tbl1 username");    $data="";    // if search true    if(isset($_post['search']))   { //    $var = $_post['search'];    if($query = mysqli_query($con,"select username fromtbl1 username '%$var%'"))    {     // possible creating duplicate results      while($row = mysqli_fetch_array($query))     {         $data .= $data . '<div>' . $row['username'] . '</div>';       }     echo $data;   }   }else{  } ?>   <html>  <head>          <script           src="https://code.jquery.com/jquery-3.0.0.js"           integrity="sha256-jrplz+8vdxt2fne1zvzxckccebi/c8dt5xyaqbjxqio="           crossorigin="anonymous"></script>            <script>              $(function(){                 $('.input').keyup(function(){                     var = $('.input').val();                     $.post('livesusers.php',{"search":a},function(data){                         $('#display').html(data);                     });                 });             });          </script>   </head> <body>   // form input text  , search   <form action= "livesusers.php" method='post'>     <input type="text" name="search" class='input'>   </form>   <div id='display' style='margin-top:100px'></div> </body>

the error in while loop said. concatenating twice on each cicle.

try replace this:

// possible creating duplicate results      while($row = mysqli_fetch_array($query))     {         $data .= $data . '<div>' . $row['username'] . '</div>';       }     echo $data;

to this:

while($row = mysqli_fetch_array($query)) {     $data .= '<div>' . $row['username'] . '</div>';   } echo $data;

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