Forgot to add my code..

  function select($query) {
   if (!$this->get_pgsql_connection_status()) {
    $this->open();
   }

   if ($this->get_pgsql_connection_status()) {
    $result_query = pg_exec($this->pgsql_dbh, $query);
    if (isset($result_query) && pg_numrows($result_query) > 0) {
     $result_array = array();
     for ($i = 0; $i < pg_numrows($result_query); $i++) {
      $result_array[$i] = pg_fetch_array($result_query, $i);
     }

     $this->close();
     return $result_array;
    }

    $this->close();
   }

   return false;
  }

This is not a bug, see this in the manual: (www.php.net/pg_fetch_array)

   Pg_fetch_array() is an extended version of pg_fetch_row(). In addition
   to storing the data in the numeric indices of the result array, it
   also stores the data in associative indices, using the field names as
   keys.