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Yaf_Session::valid() is a method in the Yaf framework of PHP that is used to check if the current session is valid or not.

When called, it internally checks if the session ID is valid and if the session has expired or not. If the session is valid, it returns true; otherwise, it returns false.

Here's an example of how you can use Yaf_Session::valid():

php
if (Yaf_Session::valid()) {
echo "Session is valid";
} else {
echo "Session is not valid";
}


In this example, if the session is valid, it will output "Session is valid". If the session is not valid or has expired, it will output "Session is not valid".

It's important to note that the Yaf_Session class is a custom session handler provided by the Yaf framework. It may have additional functionality and configuration options specific to the framework.