MySQL-PHP-XML output -


i'm relatively inexperienced programmer trying work through current project. basically, i'm designing feature database; using search query able have information inserted form letter. @ point, i'm trying translate results search xml format using xmlwriter, unfortunately search page isn't being generated anymore. i'm using code based on solution offered i've included php code below, , feedback welcome 

    <?php       session_start();      include 'conn.php';       if(empty($_session['username']) || empty($_session['password']))          print("access database denied");      else {          $username = $_session['username'];          $password = $_session['password'];          $type = $_session['type'];           if($type == "admin") {              include '../includes/aheader.html';          }          if($type == "user") {              include '../includes/uheader.html';          }          if(isset($_post["searchbutton"])) {              $keyword = $_post['keyword'];              $choice = $_post['choice'];          if($choice == "company_name")              $sql = $mysqli -> prepare("select * clients company_name ?");           if($choice == "project_code")              $sql = $mysqli -> prepare("select * clients project_code ?");           $keyword = '%'.$keyword.'%';          $sql -> bind_param('s', $keyword);          $sql -> execute();          $result = $sql -> get_result();           if(!$result)                  print("<p>select query failed</p>");              else {          if($result -> num_rows == 0)                  print("<p>no match found</p>");             else {                 header("content-type: text/html/force-download");                 header("content-disposition: attachment; filename='file_name.xml'");                  $xml = new xmlwriter();                  $xml -> openuri("test.xml");                 $xml -> startdocument("1.0", "utf-8");                 $xml -> setindent(true);                  while($row = mysql_fetch_assoc($results)) {                     $xml -> startelement("clients");                      $xml -> writeattribute('company_name', $row['company_name']);                     $xml -> writeattribute('phone', $row['phone']);                     $xml -> writeattribute('address', $row['address']);                     $xml -> writeattribute('approximate_employees', $row['approximate_employees']);                     $xml -> writeattribute('project_code', $row['project_code']);                     $xml -> writeraw($row['clients']);                      $xml -> endelement();                }                 $xml -> endelement();                 header('content-type: text/xml');                $xml -> flush();             }         }     } } ?>


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