a timer callback function?

Is there any function in phpgtk like gtk_timeout_add where you can specify
a certain number of seconds and a callback function and it will call the
function after that number of seconds? Something like this:

$timer = &new GtkTimeout;
$timer->add (600, foo, NULL);

function foo ($userdata)
{
	echo "it's been 600 seconds!\n";
}


Thanks for the help.  I apologize in advanced if I can already do this.
:-)
	- Dan
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