Question

I have a simple html form. On php page. A simple list is placed on form. I submit this form (selected list items) to this page so it gives me page refresh. I want items which were POSTED to be selected after form was submited.

For my form I use such code, And It works just fine, But is it optimal or you can suggest some optimization for my code?

<form action="FormPage.php" method="post">
   <select id="Streams" class="multiselect ui-widget-content ui-corner-all" multiple="multiple" name="Streams[]">
     <?php      
     $query = "
SELECT s.streamId, s.userId, u.username
FROM streams AS s
JOIN user AS u ON s.userId = u.id
LIMIT 0 , 30
  ";
$streams_set = mysql_query($query, $connection);
    confirm_query($streams_set);    
    $streams_count = mysql_num_rows($streams_set);

while ($row = mysql_fetch_array($streams_set)){


      if (isset($_POST['submitForm'])){

      $array =  $_POST[Streams];
$count = count($array);
echo ",sid=" ;
for ($i = 0; $i < $count; $i++) {
 if($array[$i] == $row['streamId']){  echo '<option value="' , $row['streamId'] , '" selected="selected" >  ' , $row['username'] , ' (' , $row['streamId'] ,')' ,'</option> ';    }else
     {  echo '<option value="' , $row['streamId'] , '">  ' , $row['username'] , ' (' , $row['streamId'] ,')' ,'</option> ';  }
 }
} else { echo '<option value="' , $row['streamId'] , '">  ' , $row['username'] , ' (' , $row['streamId'] ,')' ,'</option> ';}

}
      </select>
      <br/>
      <input type="submit" class="ui-state-default ui-corner-all" name="submitForm" id="submitForm"  value="Play Stream from selected URL's!"/>    
  </fieldset>
</form>

Answer 1

<form action="FormPage.php" method="post">
   <select id="Streams" class="multiselect ui-widget-content ui-corner-all" multiple="multiple" name="Streams[]">
     <?php      
     $query = "
SELECT s.streamId, s.userId, u.username
FROM streams AS s
JOIN user AS u ON s.userId = u.id
LIMIT 0 , 30
  ";
$streams_set = mysql_query($query, $connection);
    confirm_query($streams_set);    
    $streams_count = mysql_num_rows($streams_set);

while ($row = mysql_fetch_array($streams_set)){
 echo '<option value="' . $row['streamId'] . '"' . (in_array($row['streamId'], $_POST['Streams']) ? ' selected' : ''). '>  ' . $row['username'] . ' (' . $row['streamId'] .')' .'</option> ';
} ?>
      </select>
      <br/>
      <input type="submit" class="ui-state-default ui-corner-all" name="submitForm" id="submitForm"  value="Play Stream from selected URL's!"/>    
  </fieldset>
</form>