Description:
------------
If fci/fcc are acquired via zend_is_callable and the callback is subsequently not used, the call trampoline is leaked. The script demonstrates this using array_map() and the method name -- of course, this also affects other functions, and the trampoline itself may also be leaked.

Test script:
---------------
<?php

class Test {
    public function __call($name, $args) {
        echo "__call()\n";
    }
}

$name = "foo" . ($x = "bar");
array_map([new Test, $name], []);