[PHP] How do I get the first element's key of an array of objects?

[Daevid Vincent]

I have an array of objects in PHP5. Each element's key is the database row
ID.

I don't see a graceful way of finding the first element's key ID.

So I have this...

Array
(
    [3] => fooObject Object
        (
            [id:protected] => 3
            [model:protected] => ABC
            [read:protected] => public
            [write:protected] => private
        )
    [5] => fooObject Object
        (
            [id:protected] => 5
            [model:protected] => DEF
            [read:protected] => public
            [write:protected] => private
        )
)


Etc.

I want to get [3] somehow.

http://www.php.net/manual/en/function.array-pop.php
array_pop() pops and returns the last value of the array, shortening the
array by one element.
Which is opposite of what I want.

http://www.php.net/manual/en/function.array-shift.php
Shift an element off the beginning of array 
But this reduces the array :(

My hack is to do this:

        foreach($fooObject as $key => $object)
        {
                $id = $key;
                break;
        }

There has to be a better way. Something more elegant?

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