Best way of iterating over object member fields?

[Peter Ford <pete@xxxxxxxxxxxxx>]

I came across a bug in some of my code, where I do something like the following:

$obj = new MyObject();

foreach ($obj as $key=>$value)

{

    echo $key;

}


Note that I don't use $value in the loop - I'm only doing processing based on 
the field name.
Now my IDE flags this unused variable as a hint, so (on autopilot) I changed it 
to be

$obj = new MyObject();
foreach (array_keys($obj) as $key)
{
   echo $key;
}

Which removes the hint, and looks like the right sort of thing.
Of course this doesn't work: "array_keys() expects parameter 1 to be an array, 
object found".

So what is the correct way to list the field names of an object?

Cheers
Pete

--
Peter Ford                            phone: 01580 893333 fax: 01580 893399
Justcroft International Ltd.                              www.justcroft.com
Justcroft House, High Street, Staplehurst, Kent   TN12 0AH   United Kingdom
Registered in England and Wales: 2297906
Registered office: Stag Gates House, 63/64 The Avenue, Southampton SO17 1XS


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