Description:
------------
I want to use function inside complex (curly) syntax, for example:

    $name = '  Some name ';
    echo "Your name is {trim($name)}.";

I expected to see:

    Your name is Some name.

but I've got:

    Your name is {trim(  Some name )}.

So I've added $ before {:

    echo "Your name is ${trim($name)}";

and now I've got PHP Notice:

    Undefined variable: Some name

It's Ok, there isn't that variable but why php call the method trim?

Test script:
---------------
function foo() {
    return 'normal_foo';
}

class Bar
{
    public function foo()
    {
        return 'class_foo';
    }
}

$bar = new Bar;

echo foo(), "\n";
echo $bar->foo(), "\n\n";

echo "foo()\n";
echo "$bar->foo()\n\n";

// Bug?
echo "{foo()}\n";
echo "{$bar->foo()}\n\n";
// END Bug?

// Here php calls function, why?
echo "${foo()}\n";

Expected result:
----------------
normal_foo
class_foo

foo()
PHP Notice:  Undefined property: Bar::$foo in /home/d0niek/test.php on line 21
()

normal_foo
class_foo

PHP Notice:  Undefined variable: normal_foo in /home/d0niek/test.php on line 26

Actual result:
--------------
normal_foo
class_foo

foo()
PHP Notice:  Undefined property: Bar::$foo in /home/d0niek/test.php on line 21
()

{foo()}
class_foo

PHP Notice:  Undefined variable: normal_foo in /home/d0niek/test.php on line 26