streams/include/session.php

<?php /** @file */

// Session management functions. These provide database storage of PHP
// session info.

$session_exists = 0;
$session_expire = 180000;




function new_cookie($time) {
    $old_sid = session_id();
    session_set_cookie_params("$time");
    session_regenerate_id(false);

    q("UPDATE session SET sid = '%s' WHERE sid = '%s'", dbesc(session_id()), dbesc($old_sid));

	if (x($_COOKIE, 'jsAvailable')) {
		if ($time) {
			$expires = time() + $time;
		} else {
			$expires = 0;
		}
		setcookie('jsAvailable', $_COOKIE['jsAvailable'], $expires);
	}
}


function ref_session_open ($s,$n) {
  return true;
}


function ref_session_read ($id) {
  global $session_exists;
  if(x($id))
    $r = q("SELECT `data` FROM `session` WHERE `sid`= '%s'", dbesc($id));
  if(count($r)) {
    $session_exists = true;
    return $r[0]['data'];
  }
  return '';
}


function ref_session_write ($id,$data) {
  global $session_exists, $session_expire;
  if(! $id || ! $data) { 
    return false; 
  }

  $expire = time() + $session_expire;
  $default_expire = time() + 300;

  if($session_exists)
    $r = q("UPDATE `session` 
            SET `data` = '%s', `expire` = '%s' 
            WHERE `sid` = '%s' LIMIT 1", 
            dbesc($data), dbesc($expire), dbesc($id));
  else
    $r = q("INSERT INTO `session`
            SET `sid` = '%s', `expire` = '%s', `data` = '%s'",
            dbesc($id), dbesc($default_expire), dbesc($data));

  return true;
}


function ref_session_close() {
  return true;
}


function ref_session_destroy ($id) {
  q("DELETE FROM `session` WHERE `sid` = '%s'", dbesc($id));
  return true;
}


function ref_session_gc($expire) {
  q("DELETE FROM session WHERE expire < %d", dbesc(time()));
  q("OPTIMIZE TABLE session");
  return true;
}

$gc_probability = 50;

ini_set('session.gc_probability', $gc_probability);
ini_set('session.use_only_cookies', 1);
ini_set('session.cookie_httponly', 1);


session_set_save_handler ('ref_session_open', 'ref_session_close', 'ref_session_read', 'ref_session_write', 'ref_session_destroy', 'ref_session_gc');