Description:
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There is no way of doing $a->$b->a where I really want $a->($b->a)

Reproduce code:
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class a {}
class b {}

$a = new a();
$b = new b();

$a->foo = "foo";
$a->bar = "bar";

$b->a = "foo";
$b->b = "bar";

$temp=$b->a;
echo $a->$temp;

echo $a->($b->a);


Expected result:
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The lines:

echo $a->$temp;

echo $a->($b->a);

should each output the same thing.

Actual result:
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Parse error: syntax error, unexpected '(', expecting T_STRING or T_VARIABLE or '{' or '$' in /tmp/test.php on line 18