CMS core class

Class CMS
{

 var $names;
 var $options;
 var $get_storage;
 var $level = 0;

 function build_select($q,$r)
 {

    $query = mysqli_query($GLOBALS["con"],$q);
    $assoc = [
              0 => "&table=",
              1 => "&column=",
              2 => "&row="
             ];

    while($row = mysqli_fetch_array($query))
    {

     $this->names[] = $row[$r];
    }

    for($i=0;$i<=sizeOf($this->names)-1;$i++)
    {

     $this->options = $this->options.'<option>'.$this->names[$i].'</option>';
    }

    echo '<select class="cms_select" onChange="location.href=\'cms.php?f'.$this->linear_associative($assoc,$this->level).'\'+this.value">'.
             $this->options.'
          </select>';

          $this->options = "";
          $this->names = "";
          $this->level++;
 }

 function linear_associative($arr,$endpoint)
 {

  $str = "";

  for($i=0;$i<=$endpoint;$i++)
  {
   $str = $str.$arr[$i].@$this->get_storage[$i];
  }

   return $str;
 }

 function analyse_get($get)
 {

  return (isset($_GET[$get])) ? true : false;
 }

 function level_up()
 {

  if($this->analyse_get("table"))
  {

    $this->get_storage[] = $_GET["table"];
    $this->build_select("describe ".$_GET["table"],"Field");
  }

  if($this->analyse_get("column"))
  {

     $this->get_storage[] = $_GET["column"];
     $this->build_select("SELECT `".$_GET["column"]."` FROM ".$_GET["table"],$_GET["column"]);
  }
 }
}