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

$array = array("foo" => "bar");

$keys = array_keys($array);

echo $keys[0];

// Output: foo

See: http://php.net/manual/en/function.array-keys.php