PHP 静态方法 init $_SESSION var？
我发现 $_SESSION var 的奇怪功能
class A
{
static function doSomething()
{
$_SESSION['foo'] = 'bar';
}
}
A::doSomething();
var_dump($_SESSION);
正如您可能猜测的那样，会话尚未启动，但 $_SESSION var 已初始化。谁能解释一下到底发生了什么？
I found strange feature with $_SESSION var
class A
{
static function doSomething()
{
$_SESSION['foo'] = 'bar';
}
}
A::doSomething();
var_dump($_SESSION);
As you may guess session is not started but $_SESSION var is initialized. Who can explain what actually happens?
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$_SESSION 是一个超全局变量，因此无需调用
session_start()即可访问它。此外，您不需要初始化 $_SESSION 数组
即可像任何其他数组一样使用它
$_SESSION is a superglobal, so it's accessible without the necessity of
session_start()having been called.Also, you don't need to initialize the $_SESSION array
to use it like any other array
$_SESSION是一个 超全局数组：因此您始终可以访问该数组。当没有 POST 请求时，这也可以工作，但您可以执行
$_POST['foo'] = 'bar'。当您尝试转到示例中的另一个页面时，您不会调用 A::doSomething，您会看到
echo $_SESSION['foo'];会抛出错误，因为您没有调用session_start();。The
$_SESSIONis a superglobal array:So you can always access this array. This would also work when there was no POST Request, but you could do
$_POST['foo'] = 'bar'.When you try to go to another page in your example, where you don't call A::doSomething, you will see, that
echo $_SESSION['foo'];will throw an error, since you didn't callsession_start();.