PHP应用：解析PHP的Yii框架中cookie和session功能的相关操作

PHP编程
$session = Yii::$app->session;
// 检查session是否开启 
if ($session->isActive) ...
// 开启session
$session->open();
// 关闭session
$session->close();
// 销毁session中所有已注册的数据
$session->destroy();

PHP编程
$session = Yii::$app->session;
// 获取session中的变量值,以下用法是相同的：
$language = $session->get('language');
$language = $session['language'];
$language = isset($_SESSION['language']) ? $_SESSION['language'] : null;
// 设置一个session变量,以下用法是相同的：
$session->set('language', 'en-US');
$session['language'] = 'en-US';
$_SESSION['language'] = 'en-US';
// 删除一个session变量,以下用法是相同的：
$session->remove('language');
unset($session['language']);
unset($_SESSION['language']);
// 检查session变量是否已存在,以下用法是相同的：
if ($session->has('language')) ...
if (isset($session['language'])) ...
if (isset($_SESSION['language'])) ...
// 遍历所有session变量,以下用法是相同的：
foreach ($session as $name => $value) ...
foreach ($_SESSION as $name => $value) ...

PHP编程
$session = Yii::$app->session;
// 如下代码不会生效
$session['captcha']['number'] = 5;
$session['captcha']['lifetime'] = 3600;
// 如下代码会生效：
$session['captcha'] = [
  'number' => 5,
  'lifetime' => 3600,
];
// 如下代码也会生效：
echo $session['captcha']['lifetime'];

PHP编程
$session = Yii::$app->session;
// 直接使用$_SESSION (确保Yii::$app->session->open() 已经调用)
$_SESSION['captcha']['number'] = 5;
$_SESSION['captcha']['lifetime'] = 3600;
// 先获取session数据到一个数组,修改数组的值,然后保存数组到session中
$captcha = $session['captcha'];
$captcha['number'] = 5;
$captcha['lifetime'] = 3600;
$session['captcha'] = $captcha;
// 使用ArrayObject 数组对象代替数组
$session['captcha'] = new \ArrayObject;
...
$session['captcha']['number'] = 5;
$session['captcha']['lifetime'] = 3600;
// 使用带通用前缀的键来存储数组
$session['captcha.number'] = 5;
$session['captcha.lifetime'] = 3600;

PHP编程
return [
  'components' => [
    'session' => [
      'class' => 'yii\web\DbSession',
      // 'db' => 'mydb', // 数据库连接的应用组件ID,默认为'db'.
      // 'sessionTable' => 'my_session', // session 数据表名,默认为'session'.
    ],
  ],
];

PHP编程
CREATE TABLE session
(
  id CHAR(40) NOT NULL PRIMARY KEY,
  expire INTEGER,
  data BLOB
)

PHP编程
$session = Yii::$app->session;
// 哀求 #1
// 设置一个名为"postDeleted" flash 信息
$session->setFlash('postDeleted', 'You have successfully deleted your post.');
// 哀求 #2
// 显示名为"postDeleted" flash 信息
echo $session->getFlash('postDeleted');
// 哀求 #3
// $result 为 false,因为flash信息已被自动删除
$result = $session->hasFlash('postDeleted');

PHP编程
$session = Yii::$app->session;
// 哀求 #1
// 在名称为"alerts"的flash信息增加数据
$session->addFlash('alerts', 'You have successfully deleted your post.');
$session->addFlash('alerts', 'You have successfully added a new friend.');
$session->addFlash('alerts', 'You are promoted.');
// 哀求 #2
// $alerts 为名为'alerts'的flash信息,为数组格式
$alerts = $session->getFlash('alerts');

PHP编程
// 从 "request"组件中获取cookie集合(yii\web\CookieCollection)
$cookies = Yii::$app->request->cookies;
// 获取名为 "language" cookie 的值,如果不存在,返回默认值"en"
$language = $cookies->getValue('language', 'en');
// 另一种方式获取名为 "language" cookie 的值
if (($cookie = $cookies->get('language')) !== null) {
  $language = $cookie->value;
}
// 可将 $cookies当作数组使用
if (isset($cookies['language'])) {
  $language = $cookies['language']->value;
}
// 判断是否存在名为"language" 的 cookie
if ($cookies->has('language')) ...
if (isset($cookies['language'])) ...

PHP编程
// 从"response"组件中获取cookie 集合(yii\web\CookieCollection)
$cookies = Yii::$app->response->cookies;
// 在要发送的响应中添加一个新的cookie
$cookies->add(new \yii\web\Cookie([
  'name' => 'language',
  'value' => 'zh-CN',
]));
// 删除一个cookie
$cookies->remove('language');
// 等同于以下删除代码
unset($cookies['language']);

PHP编程
return [
  'components' => [
    'request' => [
      'cookieValidationKey' => 'fill in a secret key here',
    ],
  ],
];