hi every body
this function
/**
* Returns a value indicating whether the user is a guest (not authenticated).
* @return boolean whether the current application user is a guest.
*/
public function getIsGuest()
{
return $this->getState('__id')===null;
}
from class CWebUser have a return i couldn’t understand
why ===null as $this->getState(’__id’) will return either a value or a null result?
It’s helper function, Quick and easy way to check if a user is a guest.
If getState is null we’re a guest, if it isn’t we’re a logged in user.
if (Yii::app()->user->isGuest)
{
...
}
if (null === Yii::app()->user->getState('__id'))
{
...
}
When a user is logging in, a call to changeIdentity made. This method saves the id of the user (by default, but can be changed) into session storage.
/**
* Changes the current user with the specified identity information.
* This method is called by {@link login} and {@link restoreFromCookie}
* when the current user needs to be populated with the corresponding
* identity information. Derived classes may override this method
* by retrieving additional user-related information. Make sure the
* parent implementation is called first.
* @param mixed $id a unique identifier for the user
* @param string $name the display name for the user
* @param array $states identity states
*/
protected function changeIdentity($id,$name,$states)
{
Yii::app()->getSession()->regenerateID();
$this->setId($id);
$this->setName($name);
$this->loadIdentityStates($states);
}
The usual way to
This information is usually set when the user is logging in (and has been verified). Usually, we want to store non private fields that can be accessed later without making a DB call (username, fullname, preferences etc)
That way, when you call getState(’__id’) on a non logged in user, NULL is returned.
Matt
i know but what is the value of adding ===null as getState will return null if not finding a data?
That is true. Just a strong check I guess.
public function getState($key,$defaultValue=null)
{
$key=$this->getStateKeyPrefix().$key;
return isset($_SESSION[$key]) ? $_SESSION[$key] : $defaultValue;
}
i got the answer now
this is a comparison ie: compare that getState is idetical to null & if so the return true;
that’s it
thanks for replay