<?php
class Recursive_ArrayAccess implements ArrayAccess{
	protected $container=array();
	protected $dirty=false;
	protected function __construct($data=array()){ foreach($data as $key=>$value){ $this[$key]=$value; } }
	public function __clone(){
		foreach($this->container as $key => $value){
			if($value instanceof self){
				$this[$key]=clone $value;
			}
		}
	}
	public function toArray(){
		$data=$this->container;
		foreach($data as $key => $value){ if($value instanceof self){ $data[$key]=$value->toArray(); } }
		return $data;
	}
	public function offsetExists($offset){ return isset($this->container[$offset]); }
	public function offsetGet($offset){ return isset($this->container[$offset]) ? $this->container[$offset]:null; }
	public function offsetSet($offset,$data){
		if(is_array($data )){ $data=new self($data); }
		if($offset===null){ $this->container[]=$data; }else{ $this->container[$offset]=$data; }
		$this->dirty=true;
	}
	public function offsetUnset($offset){
		unset($this->container[$offset]);
		$this->dirty=true;
	}
}
final class WP_Session extends Recursive_ArrayAccess implements Iterator, Countable {
	protected $session_id;
	protected $expires;
	protected $exp_variant;
	private static $instance=false;
	public static function get_instance(){
		if(!self::$instance){
			self::$instance=new self();
		}
		return self::$instance;
	}
	protected function __construct(){
		if(isset($_COOKIE[WP_SESSION_COOKIE])){
			$cookie=stripslashes($_COOKIE[WP_SESSION_COOKIE]);
			$cookie_crumbs=explode('||', $cookie);
			$this->session_id=$cookie_crumbs[0];
			$this->expires=$cookie_crumbs[1];
			$this->exp_variant=$cookie_crumbs[2];
			if(time() > $this->exp_variant){
				$this->set_expiration();
				delete_option("_wp_session_expires_{$this->session_id}");
				add_option("_wp_session_expires_{$this->session_id}", $this->expires, '', 'no');
			}
		} else {
			$this->session_id=$this->generate_id();
			$this->set_expiration();
		}
		$this->read_data();
		$this->set_cookie();
	}
	protected function set_expiration(){
		$this->exp_variant=time()+(int) apply_filters('wp_session_expiration_variant', 24 * 60);
		$this->expires=time()+(int) apply_filters('wp_session_expiration', 30 * 60);
	}
	protected function set_cookie(){
		setcookie(WP_SESSION_COOKIE,$this->session_id.'||'.$this->expires.'||'.$this->exp_variant,$this->expires,COOKIEPATH,COOKIE_DOMAIN);
	}
	protected function generate_id(){
		require_once(ABSPATH.'wp-includes/class-phpass.php');
		$hasher=new PasswordHash(8,false);
		return md5($hasher->get_random_bytes(32));
	}
	protected function read_data(){
		$this->container=get_option("_wp_session_{$this->session_id}", array());
		return $this->container;
	}
	public function write_data(){
		$option_key="_wp_session_{$this->session_id}";
		if($this->dirty){
			if(false===get_option($option_key)){
				add_option("_wp_session_{$this->session_id}",$this->container,'','no');
				add_option("_wp_session_expires_{$this->session_id}",$this->expires,'','no');
			} else{
				delete_option("_wp_session_{$this->session_id}");
				add_option("_wp_session_{$this->session_id}",$this->container,'','no');
			}
		}
	}
	public function json_out(){ return json_encode($this->container); }
	public function json_in($data){
		$array=json_decode($data);
		if(is_array($array)){
			$this->container=$array;
			return true;
		}
		return false;
	}
	public function regenerate_id($delete_old=false){
		if($delete_old){
			delete_option("_wp_session_{$this->session_id}");
		}
		$this->session_id=$this->generate_id();
		$this->set_cookie();
	}
	public function session_started(){ return !!self::$instance; }
	public function cache_expiration(){	return $this->expires; }
	public function reset(){ $this->container=array(); }
	public function current(){ return current($this->container); }
	public function key(){ return key($this->container); }
	public function next(){	next($this->container);	}
	public function rewind(){ reset($this->container); }
	public function valid(){ return $this->offsetExists($this->key()); }
	public function count(){ return count($this->container); }
}
function wp_session_cache_expire(){ $wp_session=WP_Session::get_instance(); return $wp_session->cache_expiration(); }
function wp_session_commit(){ wp_session_write_close(); }
function wp_session_decode($data){ $wp_session=WP_Session::get_instance(); return $wp_session->json_in($data); }
function wp_session_encode(){ $wp_session=WP_Session::get_instance(); return $wp_session->json_out(); }
function wp_session_regenerate_id($delete_old_session=false){
	$wp_session=WP_Session::get_instance();
	$wp_session->regenerate_id($delete_old_session);
	return true;
}
function wp_session_start(){
	$wp_session=WP_Session::get_instance();
	do_action('wp_session_start');
	return $wp_session->session_started();
}
add_action('plugins_loaded', 'wp_session_start');
function wp_session_status(){
	$wp_session=WP_Session::get_instance();
	if($wp_session->session_started()){
		return PHP_SESSION_ACTIVE;
	}
	return PHP_SESSION_NONE;
}
function wp_session_unset(){
	$wp_session=WP_Session::get_instance();
	$wp_session->reset();
}
function wp_session_write_close(){
	$wp_session=WP_Session::get_instance();
	$wp_session->write_data();
	do_action('wp_session_commit');
}
add_action('shutdown', 'wp_session_write_close');
function wp_session_cleanup(){
	global $wpdb;
	if(defined('WP_SETUP_CONFIG')){
		return;
	}
	if(! defined('WP_INSTALLING')){
		$expiration_keys=$wpdb->get_results("SELECT option_name, option_value FROM $wpdb->options WHERE option_name LIKE '_wp_session_expires_%'");
		$now=time();
		$expired_sessions=array();
		foreach($expiration_keys as $expiration){
			if($now > intval($expiration->option_value)){
				$session_id=substr($expiration->option_name, 20);
				$expired_sessions[]=$expiration->option_name;
				$expired_sessions[]="_wp_session_$session_id";
			}
		}
		if(!empty($expired_sessions)){
			$option_names=implode("','",$expired_sessions);
			$wpdb->query("DELETE FROM $wpdb->options WHERE option_name IN ('$option_names')");
		}
	}
	do_action('wp_session_cleanup');
}
add_action('wp_session_garbage_collection','wp_session_cleanup');

function wp_session_register_garbage_collection(){
	if(!wp_next_scheduled('wp_session_garbage_collection')){
		wp_schedule_event(time(),'hourly','wp_session_garbage_collection');
	}
}
add_action('wp','wp_session_register_garbage_collection');
?>