puntare le sessioni di più web server su una macchina centrale

# start memcache
apt-get install memcached
memcached -d -l 127.0.0.1 -p 11211 -u <username> -m 16
#
pecl install memcached
# ini
session.save_handler=memcached
session.save_path="127.0.0.1:11211, 127.0.0.1:11212"
# restart apache
# see phpinfo() to check it

Notice: Undefined variable: browserName in /var/www/taziomirandola.it/lib/Visitors.php on line 86

Notice: Undefined variable: browserName in /var/www/taziomirandola.it/lib/Visitors.php on line 96

Deprecated: strripos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /var/www/taziomirandola.it/lib/Visitors.php on line 96

Notice: Undefined index: HTTP_ACCEPT_LANGUAGE in /var/www/taziomirandola.it/lib/Visitors.php on line 39

Fatal error: Uncaught TypeError: Argument 1 passed to safe_text() must be of the type string, null given, called in /var/www/taziomirandola.it/lib/Visitors.php on line 39 and defined in /var/www/taziomirandola.it/lib/Visitors.php:162 Stack trace: #0 /var/www/taziomirandola.it/lib/Visitors.php(39): safe_text() #1 /var/www/taziomirandola.it/lib/Visitors.php(124): Visitors::getData() #2 [internal function]: Visitors::log() #3 {main} thrown in /var/www/taziomirandola.it/lib/Visitors.php on line 162