php session存储到文件、memcache或redis

存储在文件

修改php.ini
session.save_handler = files
session.save_path = “/home/logs/session”

或者在php代码中
ini_set(“session.save_handler”, “files”);
ini_set(“session.save_path”, “/home/logs/session″);

存储在memcache

修改php.ini
session.save_handler = “memcache”
memcache.hash_strategy = “consistent” // 设置memcache的hash算法
session.save_path = “tcp://localhost:11211” // 设置session储存的位置，多台memcache用逗号隔开，比如”tcp://localhost:11211?weight=30,tcp://localhost:12000”

或者在php代码中
ini_set(“session.save_handler”, “memcache”);
ini_set(“session.save_path”, “tcp://127.0.0.1:11211″);

存储在redis

session.save_handler = redis
session.save_path = “tcp://localhost:6379”

或者在php代码中
ini_set(“session.save_handler”, “redis”);
ini_set(“session.save_path”, “tcp://localhost:6379″);

如果在redis配置中设置了连接密码requirepass，save_path设为”tcp://localhost:6379?auth=pwd”

// 测试代码
session_start();
$_SESSION['sessionid'] = 'session content';
echo $_SESSION['sessionid'];  echo '<br/>';

$redis = new Redis();
$redis->connect("127.0.0.1","6379");
//redis用session_id作为key并且是以string的形式存储
echo 'session_id:' . session_id(); echo '<br>';
echo $redis->get('PHPREDIS_SESSION:' . session_id());

输出
session content
session_id:jd7qn0c4lnn39fs3p9gt1fjve0
sessionid|s:15:"session content";

最后，别忘了重启php-fpm和nginx
/etc/init.d/php-fpm restart
/usr/nginx/sbin/nginx -s reload