Description:
------------
With a user-defined class that extends PDO, a __call() method does 
nothing at all. The class behaves as if it didn't exist.

I've tested it on a few other internal classes (the xml-related 
ones) where it works fine, and also with all but the PDO extension 
disabled with the same result.


Reproduce code:
---------------
<?php
class test extends PDO {
    function __call($name, array $args) {
        echo "Called $name in ".__CLASS__.'<br>';
    }
    function foo() {
        echo "Called foo in ".__CLASS__.'<br>';
    }
}
$a = new test('sqlite::memory:');
$a->foo();
$a->bar();
?>

Expected result:
----------------
"Called foo in test
Called bar in test"

Actual result:
--------------
"Called foo in test

 Fatal error: Call to undefined method test::bar() in call.php on 
line 24"