php - Prepared statements doesn't return results -

i trying querys prepared statements new me , have troubles. first query , doesn't echo result table. i've done far. may realy newbie question new me.

if(isset($_get['joke_id'])){             $joke_id = $_get['joke_id'];              $qry = $con->prepare("select * joke joke_cat = ?");             $qry->bind_param('i', $joke_id);             $qry->execute();             $result = $qry->get_result();             $result->fetch_array();      $result = mysqli_query($con, $qry) or die("query failed: " . mysqli_errno($con));*/             $line = mysqli_fetch_array($result, mysql_both);              if (!$line) echo '';             $previd = -1;             $currid = $line[0];             if (isset($_get['id'])) {                 $previous_ids = array();                 {                     $previous_ids[] = $line[0];                     $currid = $line[0];                     if ($currid == $_get['id']) break;                     $previd = end($previous_ids);                     $line = mysqli_fetch_array($result, mysql_both);                 } while ($line);             }    if ($line) {                 echo "<div id=\"box\">";                 echo nl2br($line['text']) . "<br /><br />";                 echo "<div id=\"share\"><span class='st_facebook' displaytext='facebook'></span>                 <span class='st_twitter' displaytext='tweet'></span>                 <span class='st_googleplus' displaytext='google +'></span></div>";                 echo '<br /><br /><br />';                 echo "</div>";              }             else echo '<p>empty category</p><br/>'; 

this use right before try pdo , it's work no problems.

qry = "select * joke joke_cat = '$joke_id'";             $result = mysqli_query($con, $qry) or die("query failed: " . mysqli_errno($con)); 

$_get['joke_id'] , $_get['joke_cat'] set ?

or try

$qry = $con->prepare("select * joke joke_cat =:joke_cat"); $qry->bindparam(':joke_cat', $_get['joke_cat'], pdo::param_str); $qry->execute(); $result = $qry->fetchall();