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Yaf_Session::__set is a magic method in the Yaf PHP framework that allows you to set a value for a property on a session object. It is used to dynamically assign a value to a session variable.

Here is an example to illustrate its usage:

php
<?php
class MyController extends Yaf_Controller_Abstract {
public function indexAction() {
$session = Yaf_Session::getInstance(); // Get the session object

// Set a value to the session variable "username"
$session->__set('username', 'John Doe');

// Access the session variable
echo $session->username; // Output: John Doe
}
}
?>


In the example above, we create a session object using Yaf_Session::getInstance(). Then we use the __set magic method to set the value "John Doe" for the session variable "username". Finally, we access the session variable using dot notation ($session->username) and echo its value.

Keep in mind that Yaf_Session::__set is just one of the magic methods provided by the Yaf framework for session handling. There are other methods you can use to work with sessions, such as __get to retrieve the value of a session variable, __isset to check if a session variable is set, and __unset to unset a session variable.