I'm writing in my $_SESSION variable from a database, when i clicked a link.

public function getProjectById($id){
  $query="SELECT * FROM projects WHERE id=\"$id\"";
  $result=mysql_query($query);
  $num=mysql_numrows($result);

  while ($row = mysql_fetch_object($result)) {
    $_SESSION['projectid'] = $row->id;
    $_SESSION['projecttitle'] = $row->title;
    $_SESSION['projectinfo'] = $row->info;
    $_SESSION['projecttext'] = $row->text;
    $_SESSION['projectcategory'] = $row->category;
  }
}

Now my variable is overwritten and I want to show these variables in my index.php like this:

<div id="textContent">
   <?php
    if(isset($_SESSION['projecttext']) && !empty($_SESSION['projecttext'])) {
        echo $_SESSION['projecttext'];
    }else {
        echo 'No text';
    }
?></div>

But of course, my page will not refresh automatically. How can I do that?