That's calling a function that's inside the dbh class.
<?
class someclass {
function somefunction() {
return "someresult";
}
}
$someclass= new someclass;
$thistext = $someclass -> somefunction();
echo $thistext;
?>
The above code should display "someresult" to the browser.
Edit Note: I changed "blah" to "someresult" as what is returned by the function "somefunction()" from inside the class "someclass".