Cannot register_shutdown_function for max execution time

[Locustv2]

I have a controller action as follows:

public function actionTest()
{
    set_time_limit(1);
    register_shutdown_function(function()
    {
        var_dump('shutdown');
    });

    while(true){} //infinite loop
}

And i still get the fatal error "Maximum execution time of 1 second exceeded"

If i don't sleep or make the execution time to exceed, the shutdown function is called.
According to http://php.net/manual/en/function.register-shutdown-function.php#33575 and several examples from the internet, the shutdown should be called even if the execution time is exceeded.

How should i handle the execution time error?

[samdark]

Not related to Yii.