PHP: get a single key from object

Question

I have an object with a single key and its value. But I don\'t know the key to access it. What is the most efficient way to get the key without enumerating the object?

Answer 1

If you just want to access the value, you don't need the key (actually property name) at all:

$value = current((array)$object);

If you really want the property name, try this:

$key = key((array)$object);