PHP是否可以识别包含该对象的变量的名称？

Question

In PHP is it possible to identify the name of the variable containing the object? For example:

class Foo {

    public function IdentifyContainer() {
        //PHP to identify variable containing Foo.
    }

}

$bar = new Foo();
echo $bar->IdentifyContainer(); // This should echo "bar";

I have no idea if this can be done or not, but it would really help me if it can as I have 4 instances of the same class being called on a single page load and I'm trying to identify them all.

EDIT

I should have originally mentioned this is purely for debugging. debug_backtrace worked for me. Thanks to everyone who suggested it :).

Answer 1

No, not in any sane way. There's also no good reason to do this whatsoever. No, even if you think you have a good reason, you don't. Since it's perfectly possible to assign an object to several variables at once, there's no intrinsic link between an object (or any value for that matter) and the variable it's assigned to. A variable is not a "container", a variable is a placeholder in an algorithm that lets you refer to changing (variable) values.