<?php $post = $_POST['id']; ?>
    <form method="POST" action="">
            <select name="site" onchange="javascript<b></b>:submit();" class="form-control" style="float:right;width:250px;">
               <option value="">Tümü</option>
<?php
function totalorders($a,$b){
   $query = mysql_query("SELECT * FROM orders WHERE site='$a' AND status='$b'");
   $value = mysql_num_rows($query);
   return $value;
}
	$selected = '';
   $getsite = mysql_query("SELECT * FROM sites ORDER BY id DESC");
   while($value=mysql_fetch_array($getsite)){
   if($post == $value['id']) $selected = ' selected ';
      echo '<option '.$selected.' value="'.$value['id'].'">'.$value['url'].' ('.totalorders($value['id'],$status).')</option>';
   }
?>
            </select>
         </form>