Session class based on a tutorial by Philip Brown at http://culttt.com/2013/02/04/how-to-save-php-sessions-to-a-database/

class.session.php

<?php

class Session {

  private $db;
 
  public function __construct(){
    // Instantiate new Database object
    $this->db = new Database;
   
    // Set handler to overide SESSION
    session_set_save_handler(
      array($this, "_open"),
      array($this, "_close"),
      array($this, "_read"),
      array($this, "_write"),
      array($this, "_destroy"),
      array($this, "_gc")
    );
   
    // Start the session
    session_start();
  }

  public function _open(){
    // If successful
    if($this->db){
      // Return True
      return true;
    }
    // Return False
    return false;
  }

  public function _close(){
    // Close the database connection
    // If successful
    if($this->db->close()){
      // Return True
      return true;
    }
    // Return False
    return false;
  }

  public function _read($id){
    // Set query
    $this->db->query('SELECT data FROM sessions WHERE id = :id');

    // Bind the Id
    $this->db->bind(':id', $id);

    // Attempt execution
    // If successful
    if($this->db->execute()){
      // Save returned row
      $row = $this->db->single();
      // Return the data
      return $row['data'];
    }else{
      // Return an empty string
      return '';
    }
  }

  public function _write($id, $data){
    // Create time stamp
    $access = time();

    // Set query  
    $this->db->query('REPLACE INTO sessions VALUES (:id, :access, :data)');

    // Bind data
    $this->db->bind(':id', $id);
    $this->db->bind(':access', $access);  
    $this->db->bind(':data', $data);

    // Attempt Execution
    // If successful
    if($this->db->execute()){
      // Return True
      return true;
    }

    // Return False
    return false;
  }

  public function _destroy($id){
    // Set query
    $this->db->query('DELETE FROM sessions WHERE id = :id');

    // Bind data
    $this->db->bind(':id', $id);

    // Attempt execution
    // If successful
    if($this->db->execute()){
      // Return True
      return true;
    }

    // Return False
    return false;
  } 

  public function _gc($max){
    // Calculate what is to be deemed old
    $old = time() - $max;

    // Set query
    $this->db->query('DELETE FROM sessions WHERE access < :old');

    // Bind data
    $this->db->bind(':old', $old);

    // Attempt execution
    if($this->db->execute()){
      // Return True
      return true;
    }

    // Return False
    return false;
  }
}

?>

public function _gc($max) function
DELETE * FROM should be
DELETE FROM

public function _gc($max) function
DELETE * FROM should be
DELETE FROM

Thank you. Fixed.