刷新页面后PHP会话丢失

Question

我有这个奇怪的问题，当我离开我创建会话的页面时，会话值丢失，这对于手动重定向和通过php头重定向都是如此，我用于测试的代码非常简单

session_start();
error_reporting(E_ALL & ~E_NOTICE);
echo $_SESSION['hi']; // to view the value which was set last time
$_SESSION['hi'] = "yooo";
session_write_close();

我的php.ini的相关部分如下

Session Support     enabled
Registered save handlers    files user memcache
Registered serializer handlers  php php_binary wddx
**Directive |   Local Value Master | Value**
session.auto_start  Off Off
session.bug_compat_42   Off Off
session.bug_compat_warn Off Off
session.cache_expire    180 180
session.cache_limiter   nocache nocache
session.cookie_domain   no value    no value
session.cookie_httponly Off Off
session.cookie_lifetime 0   0
session.cookie_path /   /
session.cookie_secure   Off Off
session.entropy_file    no value    no value
session.entropy_length  0   0
session.gc_divisor  1000    1000
session.gc_maxlifetime  1440    1440
session.gc_probability  1   1
session.hash_bits_per_character 5   5
session.hash_function   0   0
session.name    PHPSESSID   PHPSESSID
session.referer_check   no value    no value
session.save_handler    files   files
session.save_path   /var/lib/php/session    /var/lib/php/session
session.serialize_handler   php php
session.use_cookies On  On
session.use_only_cookies    On  On
session.use_trans_sid   0   0